Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  f8913a8b628b6d8dd686744138be1b4877bdd6cf

Replace some assert() with actual code

This is related to the planned HHVM switch. assert() depends on a
setting. It may do nothing but should in these cases.

Change-Id: Ic5548eba2e0b673bd5c937bfc8c7c82915de014c