/**
  * this fills the resolved attendee cache without changing the event attendee recordset
  * 
  * @param Calendar_Model_Event $event
  */
 protected function _fillResolvedAttendeeCache($event)
 {
     if (!$event->attendee instanceof Tinebase_Record_RecordSet) {
         return;
     }
     Calendar_Model_Attender::fillResolvedAttendeesCache($event->attendee);
 }