Fix an issue where setting a recurrence end date on a Calendar event without one could fatal
Summary: Ref T11816. The underlying format of recurrence end dates swapped around a bit and we now try to compare null to a valid date if you're setting it for the first time.
- On a new event, set a recurrence end date.
- Then, removed a recurrence end date.
Reviewed By: chad
Maniphest Tasks: T11816
Differential Revision: https://secure.phabricator.com/D17150