Code review comment for lp:~deryck/launchpad/hot-bugtasks-to-hot-bugs-442170

On further discussion, we realised that there's a subtle problem with using the default_bugtask, since it isn't necessarily a task on the same bugtarget we're viewing. Instead of returning bugs, we should return the task we got back from searchTasks. That does complicate the loop in hot_bugs a bit.