Updated mediawiki/extensions
Project: mediawiki/extensions/CentralNotice  7fbd07195290f5fc22bbebbbaac1bddaa1278d2e

When bannerName is blank, don't log and complain

Stop showing worrying messages when banner name is blank.
This happens if a campaign limits traffic and the random slot
chosen has no banner in it, for example.

Change-Id: I7bc7942b9c7ab42feabb6072d55f7ca41cf09605