issue-6028: resolves 6028 - return (False, ".") instead of (False, '')
Since 4.8, repo[] no longer takes an empty string, so we update to a valid with
similar semantic.
This value is strange and we should probably use an actual node ID here,
however, this is an independent issue.
syntax: re
/figures/[^/]+\.png$
^html/
\.pyc$
~$
\.swp$
\.orig$
\.rej$
^tests/.*\.err$
^tests/easy_run.sh$
^build/
^dist/
^MANIFEST$
^docs/tutorials/.*\.rst$
\.ico$
tests/\.testtimes
^docs/training/graphs/
^docs/training/html/
^docs/training/index.html
^docs/training/graphviz-images/
^docs/training/img/
^docs/training/output/
^docs/training/pandocfilters/