XZise added a comment.
Okay the name “pywikipediabot” and the behavior looks like compat and not core. Also a quick check shows that the text is probably only in compat:
xzise@localhost:~/Programms/pywikibot/core$ git grep 'Missing namespace' xzise@localhost:~/Programms/pywikibot/compat$ git grep 'Missing namespace' wikipedia.py: warning(u"Missing namespace in family file " wikipedia.py: warning(u"Missing namespace in family file "
TASK DETAIL https://phabricator.wikimedia.org/T94601
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To: XZise Cc: XZise, Aklapper, tuxnani, Anshoe, pywikipedia-bugs