Updated mediawiki/extensions
Project: mediawiki/extensions/EducationProgram  a7d0c75b2c87e46ba269e583f0ca48bcc6eb6e35

Check revision object for course talk notification

This is a temporary fix that prevents an error while we figure out
why WikiPage::doEditContent() doesn't provide a revision object
for course sub-pages to the PageContentSaveComplete hook.

Change-Id: I03b4b2b19507f4e67dbf5e34e92e5875ad7719f9