Comment 4 for bug 904902

I *think* the root cause here is that when the bug is first nominated for a series, an entry is created in the BugNomination table. This entry is used to prevent the same series being nominated against again. When the bugtask is deleted, nothing is done to the previously created BugNomination entry, so LP doesn't realise there's no longer a nominate for that series.

I would be possible I expect to simply delete the relevant entry from the BugNomination table when a bugtask is deleted. There'd still be an audit trail due to the BugActivity records.