https://bugzilla.wikimedia.org/show_bug.cgi?id=70494
--- Comment #4 from Merlijn van Deen valhallasw@arctus.nl --- on itwiki, it should:
* return False if the file is local, * return True if the file is on commons, and * raise NoPage if the file doesn't exist at all
What's the point of fileIsShared otherwise?