XZise added a comment.
By the way I think it would've been easier if listpages would say that no pages were found. That way we could've known that not the output is a problem but something with the generator.
TASK DETAIL https://phabricator.wikimedia.org/T93474
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To: XZise Cc: valhallasw, XZise, Ciencia_Al_Poder, Aklapper, jayvdb, pywikipedia-bugs