Comment 6 for bug 424671

https://lp-oops.canonical.com/oops.py/?oopsid=OOPS-1660E1461 gives a bit more insight into why it's here, that it's doing "if message.bugs.count() == 0" in message_to_canonical_url_data and I think that may be doing something extremely expensive in

        self.path = "comments/%d" % list(bug.messages).index(message)