OF-981: Stop suppressing warning that are no longer issued
With the removal of QDox, adding an otherwise unneeded semicolon is no longer needed. Those have been removed. The corresponding suppression of the warning that signals that unneeded semicolons are used can be removed too.
Update code comment
Improves the documentation around the work-around with regards to presence processing in a MUC room, where the subject of the presence might/might not be in the collection that's being iterated over.
