Drop deprecated "boxes" and "contentnavigation" registries

Drop deprecated CWCache entity type

Update i18n after "recent" changes

Drop repair_file_1-9_migration.py

Drop a left-over 3.22 deprecation warning

[doc] fix reference to ~src/cubes in tutorial ~src/cubes refer to the $HOME/cubes directory of "src" user while ~/src/cubes refer to $HOME/src/cubes directory of current user.

[doc] replace cubicweb-ctl start by cubicweb-ctl pyramid Since twisted support is gone.

[doc] make the tutorial use a python3 virtualenv

[doc] Update README "Getting started" * install using pip and with pyramid in a virtualenv * link to pyramid.ini documentation * Use pyramid to start application since twisted support is gone

Flake8 cubicweb/devtools/httptest.py

Remove Twisted web server Twisted web server is not used anymore and has been superseded by pyramid many years ago. Furthermore, our usage is not compatible with Python 3. So we drop the "etwist" sub-package. As a consequence, "all-in-one" configuration type gets dropped as it was Twisted-specific. We resurrect it in cubicweb/pyramid/config.py by only keeping options used by the "pyramid". Similarly, we introduce a AllInOneCreateHandler in cubicweb/pyramid/pyramidctl.py that is basically the one that lived in cubicweb/etwist/twctl.py and is used to create the "all-in-one" instance. Added a TODO here about "pyramid.ini" that could be generated at the end of bootstrap() method. In cubicweb/devtools/httptest.py, CubicWebServerTC is now equivalent to CubicWebWsgiTC and the latter is dropped.

Separate twisted-specific configuration from WebConfigurationBase class This is in preparation of dropping the Twisted web server backend. We thus draw a clearer line between what's specific to twisted from what's generic by moving WebConfigurationBase class into cubicweb/web/webconfig.py and only keeping twisted-related in AllInOneConfiguration (still living in cubicweb/etwist/twconfig.py).

Flake8 cubicweb/web/webconfig.py

Flake8 cubicweb/etwist/twconfig.py

Remove ctl commands using the Twisted backend This backend is not maintained, very likely no longer used in any recent instance, and not supported in Python 3.

Flake8 cubicweb/cwctl.py * run autopep8 on the file * fixed unused imports * rename "version" import as "cw_version" in order not to shadow local variables

Remove _handle_win32() method from "create" command class This method generates code in a file using etwist module that we are about to drop.

Skip tests for ldapsource with python >= 3.7 Until someone works on fixing these, this should make our CI green again. I tried to use setupModule() to check for python version, but pre_setup_database() is apparently called even when a SkipTest exception is raised there. So handle this in that method.

[doc] Update cubicweb-ctl page about how to run an instance * remove mention of start/stop/restart/status commands that do not exist anymore * briefly mention the "pyramid" and point to respective documentation page * mention that a WSGI server should be used in production

[doc] Drop mention of the "pyramid" cube This cube got merged into cubicweb several versions ago.

[cli/enh] on 'shell' or migration command, use ipython if available

[web/test] drop dependency on third party cubes Drop dependency on cubicweb-file, cubicweb-blog and cubicweb-tag for cubicweb/web/test Copy required parts of cubes (schema, entities, views and hooks) into cubicweb/web/test/data/cubicweb-<cube> that make tests pass.

[test] drop dependency on third party cubes Drop dependency on cubicweb-file, cubicweb-localperms, cubicweb-tag and cubicweb-comment for cubicweb.test and cubicweb.sobjects.test Move cubicweb/test/data/libpython/cubicweb_* to cubicweb/test/data, so it's included in PYTHONPATH. Add missing parts of schema, entities, views, hooks that make tests pass.

[test] drop CubicWebConfigurationWithLegacyCubesTC This is used to test legacy cube import which is planned for removal in cubicweb 3.27, so drop the code.

[test] drop unittest_cubes.py This is used to test legacy cube import which is planned for removal in cubicweb 3.27, so drop the code.

[server/test] do not depend on third party cubes Drop requirement of basket, card, comment, file, localperms and tag cubes for cubicweb.server tests. Copy needed part of schema, entities, views, hooks into the cubicweb/server/test/data directory (which is included in PYTHONPATH for CubicWebTC tests). For migration tests which use different "datapath", use symlinks to have dependent cubes importables.

[server/test] drop unused variable initialization in OperationsTC.setUp() Variable "self.hm" is unused

[server/test] bootstrap config in setUpModule function This is test initialization, so use the setUpModule function for this

[schema] drop monkeypatch "name_for" on BaseConstraint BaseConstraint doesn't have "name_for" method, this is just an addition for cubicweb needs. Implement this as a function instead of a monkeypatch to avoid having "name_for" not defined because cubicweb.schema hasn't been imported. In particular this fix running cubicweb/server/test/unittest_schema2sql.py::SQLSchemaTC::test_known_values alone.

[fix] this check was too restrictive and broke tests

[fix] exception type has changed

[server.rqlannotation] refactor to make class SQLGenAnnotator consistent _annotate_select() takes SQLGenAnnotator as a first argument and is not used anywhere except in SQLGenAnnotator. This looks like a method to me. Let us fold it into its class.

Drop most of deprecated code As in previous changesets, most code has been deprecated since a very long time. This changeset concerns "core" cubicweb modules (e.g. "server", "appobjects") for which it's not easy to handle change atomically. In cubicweb/server/querier.py, we adjust empty_rset() function as a result of "rqlst" argument of ResultSet being dropped. (There was no use of the keyword argument anyways.)

Drop deprecated code in cubicweb.hooks Changelog entry will come in a later changeset.

Drop deprecated code in cubicweb.entities Also dropped an unused import along the way. Changelog entry will come in a later changeset.

Drop deprecated code in cubicweb.devtools Changelog entry will come in a later changeset.

Drop deprecated code in cubicweb.dataimport We actually drop *most* of deprecated code in this subpackage. What's left is the MetaGenerator class in (cubicweb/dataimport/stores.py) which is tricky to remove as it's still internally used by cubicweb. Changelog entry will come in a later changeset.

Drop most deprecated code in cubicweb.web This includes both Python and JavaScript code. Most code has been deprecated since a very long time (versions 3.1x mostly, more than 5 years ago, and a few things until 3.24). There are still a few deprecated things, most of which are actually used within cubicweb (or in cubes we depend on for tests). I don't know what to do with these... Removed a couple of unused imports along the way. Changelog entry will come in a later changeset.

[web] use Separator "component" instead of deprecated BoxSeparator widget

Flake8 cubicweb/web/box.py

[test] Remove upper bound for cubicweb-localperms Version 0.4.0 does not use a deprecated API that we are planning to drop in forthcoming changesets. This requires changing expected values in unittest_cwconfig.py where we scan install cubes. * In CubicWebConfigurationTC.test_available_cubes(), localperms disappears from the list of expected cubes because this test method will look for new style cubes in located in cubicweb/test/data/libpython/ (we patch pkg_resources.iter_entry_points()) as well as old style cubes installed in $PREFIX/share/cubicweb/cubes; since the new cubicweb-localperms version is new-style, it won't be catched by this method. * In CubicWebConfigurationWithLegacyCubesTC.test_available_cubes(), localperms is still listed, but now with the package name, because this method will simply look at installed cubes whether old or new style.

[test] Make the expected value explicit in CubicWebConfigurationWithLegacyCubesTC.test_available_cubes() This will help with the next changeset, and avoiding computation in tests is a good thing in general.

[test] Inline _test_available_cubes() method in cwconfig tests Improves readability.

[DX] adding error messages to {ResultSet,ActionsRegistry}.possible_actions Try to make it more accessible, when we first encountered these errors it it didn't made any sense to us.

[server/querier] remove useless indirection QuerierHelper._annotate

[server] remove useless indirection ExecutionPlan.sqlannotate Simpler is better. Use directly ExecutionPlan.querier.sqlgen_annotate.

[web] removed unused imports in basecomponents

[test] Depends on psycopg2-binary Avoids the following warning: The psycopg2 wheel package will be renamed from release 2.8; in order to keep installing from binary please use "pip install psycopg2-binary" instead. For details see: <http://initd.org/psycopg/docs/install.html#binary-install-from-pypi

[doc/changelog] the removal of next_tabindex produce an error not in the changelog When one tried to migrate to 3.25, the error "class X initialization doesn't have a settabindex argument" can happen but the word "settabindex" is not present in the changelog which makes it hard to find to which modification this error is related.

Merge with branch 3.26

[py3.7,test] Use cubicweb-file >= 2.2.2 This includes changeset aa4a3a3d0c18 fixing import of os.errno.

[flake8] Fix errors in cubicweb/ext/test/unittest_rest.py

[test] Shorten prefix string in test_rql_role_with_unknown_vid With Python3.7, this test fails as the error message returned by rest_publish() is: <p>an error occurred while interpreting this rql directive: ObjectNotFound('toto')</p> while we previously assumed a comma after 'toto'. Fixing this by only shortening the prefix used in out.startswith().

[flake8] fix errors in cubicweb_i18ntestcube/views.py test file

[test] Pass __module__ upon instantiation of RegistrableInstance This gets rid of the deprecation warning from logilab.common.registry: DeprecationWarning: instantiate MyAFS with __module__=__name__ and solves a test error on Python 3.7.

Added tag 3.26.8 for changeset 91f75319a726

[pkg] Version 3.26.8

[doc] didn't had any questions

[doc] missing import, cw now require this explicitely

[doc] add actual link to previous post

[doc] missing import in code example

[doc] add a note because uiprops.py is not generated anymore by default

[doc] recommend pip instead of apt for installing things According to a discussion on XMPP we should recommend pip instead.

[doc] fix, link to internal doc since it's not the blog post anymore

[doc] also show command with sqlite since it's recommended

[doc] fix, the cube name was used, it was the instance named that was needed

[doc] it's a tutorial, not a blog post anymore

[doc] make example more redable

[doc] uses :file:`name` everywhere + indicate file when it's not present

[doc] english typos

[doc] pep8/retab in code examples

[doc] correct import for i18n

[doc] pep8 and retab in tutorial code example

[doc] correct pip command to have needed dependancies to use the start command I know we want to remove this command but in the meantime having this documentation working seems like something good.

[doc] explain the difference between a relation and an attribute

[doc] plural

[doc] misc, put every reference to something in the code between backquotes

[doc] bold to make reading more obvious

[doc] style, switch to bullet points list to make things easier to read

[doc] explains what the <X.Y.Z> means

[doc] command output style has changed

[doc] always put file name for code example and uses :file:`path` syntax everywhere

[doc] explicitely give the local server url to make this step more obvious

[doc] start the server in debug mode, it's easier during learning

[doc] recommend sqlite during tutorial because it's simplier to use

[doc] add a link to every cube documentation page

[doc] make this step more obvious

[doc] move to latest CW version for cube creation

[doc] missng import for i18n in example

[doc] unused import in example

[doc] output has changed

[doc] blanks spaces to allow example to breath and be more lisible

[doc] default tests template has changed

[doc] default generated filename as changed

[doc] rst syntax bug, blank line needed before item list

[doc] add link to cubes contribution document

[doc] link to current documentation, not old cubicweb.org doc

[doc] translate french to english

[doc] typo, 'CW' doesn't exist in the example

[doc] always indicate the file in which the code should be put

[doc] respect pep8 in code examples

[doc] serie a small improvments

[doc] typo, the field is "name" not "title"

[doc] fix, command "create" is missing base cube

[doc] improve blog tutorial first steps and explain common errors

[doc] new behavior in virtualenv since 3.26

[skeleton] use python3 flake8 In tox "flake8" environment, use python 3 virtualenv, so we can check for python3 incompatible syntax.

[skeleton] drop whitelist_externals for flake8 whitelist_externals makes sense when used with sitepackages=true. In this case it will always rely on $VIRTUAL_ENV/bin/flake8 so, the whitelist_externals has no effect.

Fix flake8 issues since release 3.6.0 Flake8 had a new release which raise new issues, namely: W504: line break after binary operator F841: local variable 'ex' is assigned to but never used W605: invalid escape sequence F821: undefined name 'buffer' (noqa seems the only way to avoid this false positive) Also pin flake8>=3.6 in our tests and make explicit that we use python3 to run flake8 tests.

Fix typo in RDFS URI

[server] Fixed issue with the adapters cache of a cloned EditedEntity The adapters' cache of the entity within an EditedEntity used to be copied along the entity itself during a cloning operation of the EditedEntity. This raises an issue when the adapters' cache is not empty and contains cached values linking to transaction-specific data (or the transaction itself). This prevents the clone EditedEntity being used in a transaction outside the one that created it. This change resets the adapters' cache of the new copy so that no cached value remain. The new copy can then be used in a new transaction afterwards.

[py37] `async` is now a reserved keyword

[skeleton] Use "py3" as tox environment instead of "py34"

[views/startup] drop a duplicate rql query in manage view Counting entities in `nb` is already done above this code, regression introduced by a85db6fa

Depend on cubicweb-file >= 2.0.0 I applied V1 of the patch, but V2 contained this extra hunk...

[test] Update webconfig's tests accounting for cubicweb-file being now a package WebconfigTC.test_locate_all_files and WebconfigTC.test_locate_resource assumed that cubicweb-file was installed in <share>/cubes/file whereas, from the latest release, it is now a standard Python package thus installed in site-packages as cubicweb_file. We simply update base directory of these two tests.

[widgets.js] fix obvious bug detected by sonar

[views/uicfg] obvious bug detected by sonar

[style] Make toolsutils.py flake8-clean Run `autopep8 --max-line-length 100 -i cubicweb/toolsutils.py` and fixed unused imports.

[test/rset] typo

[test/rset] flake8

[py3] import configparser from six.moves instead of using a try/except Using six is better than the try/except because it clearly indicates compatibility code. Also, when using tools such as vermin which relies on AST, it helps getting rid of false compatibility errors.

[doc] didn't had any questions

[doc] missing import, cw now require this explicitely

[doc] add actual link to previous post

[doc] missing import in code example

[doc] add a note because uiprops.py is not generated anymore by default

[doc] recommend pip instead of apt for installing things According to a discussion on XMPP we should recommend pip instead.

[doc] fix, link to internal doc since it's not the blog post anymore

[doc] also show command with sqlite since it's recommended

[doc] fix, the cube name was used, it was the instance named that was needed

[doc] it's a tutorial, not a blog post anymore

[doc] make example more redable

[doc] uses :file:`name` everywhere + indicate file when it's not present

[doc] english typos

[doc] pep8/retab in code examples

[doc] correct import for i18n

[doc] pep8 and retab in tutorial code example

[doc] correct pip command to have needed dependancies to use the start command I know we want to remove this command but in the meantime having this documentation working seems like something good.

[doc] explain the difference between a relation and an attribute

[doc] plural

[doc] misc, put every reference to something in the code between backquotes

[doc] bold to make reading more obvious

[doc] style, switch to bullet points list to make things easier to read

[doc] explains what the <X.Y.Z> means

[doc] command output style has changed

[doc] always put file name for code example and uses :file:`path` syntax everywhere

[doc] explicitely give the local server url to make this step more obvious

[doc] start the server in debug mode, it's easier during learning

[doc] recommend sqlite during tutorial because it's simplier to use

[doc] add a link to every cube documentation page

[doc] make this step more obvious

[doc] move to latest CW version for cube creation

[doc] missng import for i18n in example

[doc] unused import in example

[doc] output has changed

[doc] blanks spaces to allow example to breath and be more lisible

[doc] default tests template has changed

[doc] default generated filename as changed

[doc] rst syntax bug, blank line needed before item list

[doc] add link to cubes contribution document

Merge 3.26

[doc] link to current documentation, not old cubicweb.org doc

Explicitly require repoze.lru for Pyramid tests This used to be pulled by pyramid but the dependency got dropped in pyramid version 1.10, see: https://docs.pylonsproject.org/projects/pyramid/en/latest/whatsnew-1.10.html#backward-incompatibilities We already have an explicit dependency in setup.py, but it was missing for tests. Perhaps we could simply use '.[pyramid]' in this requirements file? Not sure what side effect it'd have though...

[cubicweb-ctl] make uid option obvious

[README] point to xmpp room for contributors

[doc] link to README regarding how to contribute to the code base

[README] improve contribution section with links and command examples

[README] point to logilab's jenkins in tests section

[pyramid] improve pyramid warning with link to doc on how to write pyramid.ini file

[doc] translate french to english

[doc] typo, 'CW' doesn't exist in the example

[doc] always indicate the file in which the code should be put

[doc] respect pep8 in code examples

[doc] serie a small improvments

[doc] typo, the field is "name" not "title"

[doc] fix, command "create" is missing base cube

[doc] improve blog tutorial first steps and explain common errors

[doc] how to install pyramid or twisted application server

[doc] new behavior in virtualenv since 3.26

[skeleton] use python3 flake8 In tox "flake8" environment, use python 3 virtualenv, so we can check for python3 incompatible syntax.

[skeleton] drop whitelist_externals for flake8 whitelist_externals makes sense when used with sitepackages=true. In this case it will always rely on $VIRTUAL_ENV/bin/flake8 so, the whitelist_externals has no effect.

Add changelog note for running tests with pytest-xdist

Make test database template creation concurrent build_db_cache() is used in tests to create test database templates, i.e. DEFAULT_EMPTY_DB_ID (which is __default_empty_db__) and custom template database using CubicwebTC test_db_id/pre_setup_database API. When running tests in parallel using multiple processes, build_db_cache() may try to build the same database twice. Avoid this by adding synchronisation of process by using a file lock. So when two processes require the same template database, one build the database and others wait it to be created. Use filelock (https://github.com/benediktschmitt/py-filelock) library to have a portable (unix / windows) way for handling locks. Also filelock is packaged in debian: https://packages.debian.org/source/python-filelock

Make test database cache lookup concurrent has_cache() is used to dertermine if the template database already exists or not. When running tests accross multiple process, has_cache() wasn't aware of databases created by other processes because it used a cache to generate the cache... Since the discovering discover_cached_db() time is quite reasonable (it's just about listing file in a directory), let re-generate the cache on cache miss.

Fix flake8 issues since release 3.6.0 Flake8 had a new release which raise new issues, namely: W504: line break after binary operator F841: local variable 'ex' is assigned to but never used W605: invalid escape sequence F821: undefined name 'buffer' (noqa seems the only way to avoid this false positive) Also pin flake8>=3.6 in our tests and make explicit that we use python3 to run flake8 tests.

Stabilize flake8 tests on 3.26 branch Use basepython=python2 or flake8 installed with python3 will raise "[F821] undefined name 'buffer'" Pin flake8 < 3.6 which has new checks that doesn't pass on our current code base.

Fix typo in RDFS URI

[doc] Do not rely on lgc's sphinx_ext This module is broken (getting an ImportError) and I don't want to fix it. The only usage we make of it is for the "autodocstring" directive, and I don't know what it does. Based on the context, replacing autodocstring with either automodule or autoclass and removing sphinx_ext from required Sphinx extensions.

Added tag 3.26.7 for changeset ee4ad63c91e5

[pkg] Version 3.26.7

Fix possible double import of cubes For a new-style cube, if we import "cubicweb_<name>" and then import "cubes.<name>", the cube will be imported twice. cubes.<name> and then cubicweb_name is ok though... When using pyramid, we try to find which cube define a "includeme" by importing them with the name "cubes.<name>", so we (possibly ?) double import all new-style cube. This case may also occur in tests with PyramidCWTest. Touching the import loader to fix this scares me, so let's fix this by testing "cubicweb_<name>" *before* "cubes.name" (for old style cubes, importing cubicweb_<name> raise ImportError).

[autoform] Make RelationField.fromcardinality a class method factory Instead of having the "RelationField" class hard-coded in this factory method (thus preventing any subclass to properly use it), we make that method a classmethod and instantiate the actual class instead of the base one.

[autoform] Use fieldclass from kwargs in guess_field for non-final relations This follows up on af969080e7e6 in which a "fieldclass" kwarg has been added in EntityFieldsForm.field_by_name() before calling guess_field(). In this changeset, this value was only used for final relation but the way non-final relation actually also changed since we also use guess_field from these relation (previously, the field class specified through uicfg was instantiated directly in EntityFieldsForm.field_by_name()). So in the non-final case in guess_field() we simply try to retrieve "fieldclass" from kwargs and fall back to RelationField.

[py37] `async` is now a reserved keyword

Merge 3.26

Added tag 3.26.6, debian/3.26.6-1 for changeset 8362503a9248

[pkg] version 3.26.6

[py3] Replace unicode keyword which is unknown in python3

[skeleton] Use "py3" as tox environment instead of "py34"

Added tag 3.26.5 for changeset 76d7b0aa94d2

[pkg] Version 3.26.5

Merge with 3.26

[py3] Use "utf-8" as input encoding for docutils in rest extension Docutils says that "unicode" is an unknown encoding on Python3. Not sure where "unicode" as an encoding comes (it's there since showtime) but "utf-8" seems more appropriate. From now on, rendering of CubicWeb's rst directive (e.g. ..winclude) works on Python 3. Accordingly, we extend wdoc's test to demonstrate this. For this we need to install docutils in tox's web environment.

[py3] Avoid setting attribute on Element instance in wdoc view This change is needed to make "wdoc" view work on Python 3. Indeed, before this patch, we used to set a "parent" attribute on Element instances, which is not permitted since Python 3.3 as xml.etree.ElementTree uses the C implementation by default. To get rid of this "parent" attribute, we rework the XML nodes processing logic to return and retrieve a node along with its parent in several place of the code. Namely, build_toc_index() now accepts the "parent" value for "node" and inserts it in the "index" dict (thus avoid `node.parent = <value>`). Respectively, every query to the "index" dict is updated to also retrieve the "parent" (thus avoiding `<value> = node.parent`). Later in InlineHelpView class, the "index" dict is bound to "tocindex" attribute so we adjust how it is queried in respective methods. Tests cubicweb/web/test/unittest_views_wdoc.py now pass on Python 3.

[test] Add a trivial test for "wdoc" view We just make sure it gets rendered without errors (which wasn't the case before the previous patch). It does not work on Python 3; this will be fixed in next changeset.

[py3] Open rst file in text mode in wdoc view Otherwise, UStringIO complains that it receives bytes.

[ext/rest] Drop "handle_io_errors" argument to docutils' FileInput This argument is deprecated and ignore in docutils since version 0.10. Besides, its default value is None which is the same as we passed.

[wdoc] Remove fallback about xml.etree module Module xml.etree exists since python 2.5.

[wdoc] Avoid usage of deprecated xlm elementree getchildren() method Use list(node) as suggested by the deprecation warning.

[style] Make cubicweb/web/views/wdoc.py flake8-clean

[py3] Use six.text_type instead of unicode in wdoc views

[views/startup] drop a duplicate rql query in manage view Counting entities in `nb` is already done above this code, regression introduced by a85db6fa

Merge with 3.26

Added tag 3.26.4, debian/3.26.4-1 for changeset e1c1af68db86

[pkg] Version 3.26.4

[py3] ensure AjaxController return bytes publish() must return bytes, when the @ajaxfunc decorated method return None, this raised: TypeError: You cannot set Response.body to a text object (use Response.text)

[py3] Let InstanceCommand.run_arg() always return an int The caller of this method (which is method "run_args") does `max(status, self.run_arg(appid))` and run_arg might return None if the underlying <cmdname>_instance method returns None. On python3 max(1, None) breaks with "TypeError: unorderable types: int() > NoneType()". So we enforce run_arg() method to return an integer even if the underlying method returns None. This fixes call of "cubicweb-ctl i18ninstance" with Python3.

[test] Use cubicweb-file < 2.0.0 From version 2.0.0, cubicweb-file moved to new-style layout (Python package) but we still expect it to be an old-style cube in CubicWeb's tests (WebconfigTC in web/test/unittest_webconfig.py).

[py3] Decode subprocess stdout in toolsutils.show_diffs() On Python 3, subprocess' pipes are bytes stream so we must decode them before printing. Without this change, diff of configuration files (e.g. all-in-one.conf as displayed upon instance upgrade) will rendered as a single line on Python 3.

[python3] make sure staticcontroller returns a bytes instance The ``publish()`` method of controller is supposed to return a bytes intsance. Returning a text_type instance will crash later on in the Pyramid response handler when assigning content to ``response.body`` (at least in Python3):: >>> from pyramid.response import Response >>> r = Response() >>> r.body = '' Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/home/adim/.virtualenvs/…/response.py", line 562, in _body__set raise TypeError(msg) TypeError: You cannot set Response.body to a text object (use Response.text)

[python3] use inspect.getfullargspec instead of inspect.getargspec The latter is now deprecated

[py3] ensure AjaxController return bytes publish() must return bytes, when the @ajaxfunc decorated method return None, this raised: TypeError: You cannot set Response.body to a text object (use Response.text)

[py3] Let InstanceCommand.run_arg() always return an int The caller of this method (which is method "run_args") does `max(status, self.run_arg(appid))` and run_arg might return None if the underlying <cmdname>_instance method returns None. On python3 max(1, None) breaks with "TypeError: unorderable types: int() > NoneType()". So we enforce run_arg() method to return an integer even if the underlying method returns None. This fixes call of "cubicweb-ctl i18ninstance" with Python3.