Updated mediawiki/extensions
Project: mediawiki/extensions/Translate  ef2dd7556b17ffc17a2e3c8570ea9731caa7bfec

Handle null message content gracefully

This skips messages for which we fail to load any content.
This avoids null messages showing up in Special:TranslationStash.

Change-Id: I019e6635726f06f6c1bf1de1ccaf977b587ce44e