Updated mediawiki/extensions
Project: mediawiki/extensions/CommunityVoice  50d909b0070caceae7fbfd3194f6a13b0b499fcd

Add comments for grep

* communityvoice-ratings-error-missing-argument is undefined
* communityvoice-ratings-error-no-* are unused

Change-Id: Ib1471b2d28ae39ce010a7d33e200795450d09c09