Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  53a0cff0217dd728c28256743197b3279cbe44ba

Cleanup some EntityStore JavaScript code

Idx next to id is confusing (could mean "id extended").

It's not the expected number of returns if it's minus one.

Change-Id: I096c3f4b3eada845371ad6d80ec0d8841277dd32