Comment Notifications don't use Computed Name

(Bug, Closed -> Fixed, Priority: Critical, Test Status: No automated tests yet , Reported By Bad Link: Thing 3y284oe not found, )
Conversations, Notifications
Summary: If you comment on a Thing that doesn't have a Name, you'll get a Notification titled, eg, Comment on ".bu6oc7u"
The problem is entirely obvious: we're using thing.displayName instead of thing.nameOrComputed. Fixing this is a mild hassle, but no longer rocket science.