wsgi: clearer exception when CW_INSTANCE is missing
instance_name is mandatory for cwcfg.config_for()
Raise with a KeyError: 'CW_INSTANCE' instead of hard to read exception.
.. _tools_module:
:mod:`pyramid_cubicweb.tools`
----------------------------
.. automodule:: pyramid_cubicweb.tools
.. autofunction:: includeme
.. autofunction:: clone_user
.. autofunction:: cnx_attach_entity
.. autofunction:: cached_build_user
.. autofunction:: clear_cache