Notice: Trying to get property of non-object in _forum_access_comment_access_callback()

I noticed a lot of watchdog posts:

Notice: Trying to get property of non-object in _forum_access_comment_access_callback()

And tracked it down to a situation in which the comment had been deleted and cleared from the system. This particular client expects to be doing that a lot, so there's a pretty high occurrence of this sort of thing. It's not a terribly critical need, but it would make my watchdog tracking cleaner if it was handled better. Thankfully it's a really easy fix too. I'd hate to have to reapply this patch on every update - so I'm passing it up the chain. Lemme know if you have any questions.