SECURITY: Do not let users thank for a log entry if actor was deleted
SECURITY: Do not let users thank for a log entry if actor was deleted

This prevents users from accessing information about the actor
by abusing uselang=qqx and the thank button.

Bug: T224240
Change-Id: I3f42d56874776cfa0c9d364217f43253efc14782

wikimedia/mediawiki-extensions-Thanks,wikimedia/mediawiki-extensions-Thanks,wikimedia/mediawiki-extensions-Thanks