Make sure we don't delete elements of the iterator as we iterate over it. This resulted in not all ATTENDEEs being removed from the iTIP reply data.
Make sure we don't delete elements of the iterator as we iterate over it. This resulted in not all ATTENDEEs being
removed from the iTIP reply data.

git-svn-id: 81e381228600e5752b80483efd2b45b26c451ea2@1785 e27351fd-9f3e-4f54-a53b-843176b1656c

trevor/calendarserver,trevor/calendarserver,trevor/calendarserver