status = await c.FullStatus(None)
- return status.applications[app]['units'][self.name].get(
- 'leader', False)
+ try:
+ return status.applications[app]['units'][self.name].get(
+ 'leader', False)
+ except KeyError:
+ # FullStatus may be more up-to-date than the model
+ # referenced by this class. If this unit has been
+ # destroyed between the time the class was created and the
+ # time that we call this method, we'll get a KeyError. In
+ # that case, we simply return False, as a destroyed unit
+ # is not a leader.
+ return False