XZise added a comment.
Just for the record it seems that a similar error exists in category.py. I've provided a fix https://gerrit.wikimedia.org/r/194396/ .
TASK DETAIL https://phabricator.wikimedia.org/T91234
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To: Xqt, XZise Cc: Ricordisamoa, gerritbot, XZise, Xqt, Aklapper, jayvdb, pywikipedia-bugs