Account/Workspace creation: manage case where raidcale is down

tracim/tracim/lib/calendar.py

 
 import re
 import transaction
+from caldav.lib.error import PutError
 
 from icalendar import Event as iCalendarEvent
 from sqlalchemy.orm.exc import NoResultFound
 END:VEVENT
 END:VCALENDAR
 """.format(uid='{0}FAKEEVENT'.format(related_object_id))
-        event = user_calendar.add_event(event_ics)
-        event.delete()
+        try:
+            event = user_calendar.add_event(event_ics)
+            event.delete()
+        except PutError:
+            pass  # TODO BS 20161128: Radicale is down. Record this event ?