Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  17a944db884016384bd608312fe3fdb9745d9f7a

(bug 46624) Avoid fatal when undoing deleted rev.

An undo action that involved a revision that was delted, oversighted or otherwise
missing content triggered a fatal error. Added a check and nice error message.-

Change-Id: I37e82b999d7eea7cf3761960a3d3df467582a596