def clean(self):
        """Remove services without host object linked to

        Note that this should not happen!

        :return: None
        """
        to_del = []
        for serv in self:
            if not serv.host:
                to_del.append(serv.uuid)
        for service_uuid in to_del:
            del self.items[service_uuid]
Remove services without host object linked to

        Note that this should not happen!

        :return: None