Handle the case where we run out of events on a calendar _and_ we run out of calendars - just abandon the invitation attempt.
Handle the case where we run out of events on a calendar _and_ we run out of calendars - just abandon the invitation attempt.

git-svn-id: 0c33e958600270102f91bf5868e396345dde476c@7580 e27351fd-9f3e-4f54-a53b-843176b1656c

red-hood/calendarserver,red-hood/calendarserver,red-hood/calendarserver,red-hood/calendarserver,red-hood/calendarserver,red-hood/calendarserver