errbit/errbit — pull request #234 by boblail (2012-08-29 04:18:14+00:00)
Title: Make sure the Problem#last_notice_at is not null

Problems sorted by `last_notice_at` would occasionally appear to be all jumbled. They would fall out of order when `last_notice_at` was nil, but they would still appear to have values for `last_notice_at` because the view was rendering `created_at` when the former was nil.

c.f. #158