https://bugzilla.wikimedia.org/show_bug.cgi?id=71104
--- Comment #3 from Fabian CommodoreFabianus@gmx.de --- Okay 'prop=pageprops' doesn't work how I thought it worked. And because there are other cases in which update_page was called, I made a more general fix: 'update_page' now receives the property with which the pagedict was obtained. If any value in the result is only present for a specific property and a missing value could indicate that it's False or not requested, this does allow an easy check to determine between both possibilites.