Will try to fetch the default calendar when a user is found with the corresponding email address When no calendar is found the calendarId will remain empty for the Attendee.
Will try to fetch the default calendar when a user is found with the corresponding email address
When no calendar is found the calendarId will remain empty for the Attendee.

Fixes Intermesh/groupoffice-webclient#3
Intermesh/groupoffice-server,Intermesh/groupoffice-server,Intermesh/groupoffice-server