Fix remove event handling in case we already removed the domain.

            self.domains[vm.name] = vm

            self.handler.tag_db.add_sub_object(vm.name, vm.tags.itervalues())

        elif event == 'Removed':

            try:

                vm = self.domains.pop(dom.name())

            logger.info('Removed domain %s', vm.name)

            except KeyError:

                # domain already removed, see hypervisor/domains/vm_tags.py

                # sometimes libvirt send us the remove event too late

                # we still update storage and tag attributes

                pass

            else:

                self.handler.tag_db.remove_sub_object(vm.name)

                # update Storage pools in case VM had volumes that were deleted

            logger.info('Removed domain %s', vm.name)

            self.storage.update()

        elif event in ('Started', 'Suspended', 'Resumed', 'Stopped', 'Saved',

                       'Restored'):