Race condition fix: a DELETE can remove a resource after the calendar-multiget code has already determined that resource exists.  In this case, we now return a 404 response for that resource within the multistatus.
Race condition fix: a DELETE can remove a resource after the calendar-multiget code has already determined that resource exists.  In this case, we now return a 404 response for that resource within the multistatus.


git-svn-id: 81e381228600e5752b80483efd2b45b26c451ea2@3586 e27351fd-9f3e-4f54-a53b-843176b1656c

trevor/calendarserver,trevor/calendarserver,trevor/calendarserver