Show "none" for attendee status for new events

* This got broken at some point in HC, and resulted in the two
  bugs referenced here.
* Note that we still don't have a way to assure that our attendee
  status in Exchange 2007 is correct and consistent.  This is
  reported in bug #2524563, which remains open
* I've again pinged Microsoft re: advice on how to handle this

Bug: 4363040
Bug: 5077200
Change-Id: I848064d4a4b2497e1d78f4eebeb8955d7c31bab9
1 file changed