def remove(self, key, category=None):
        for key in make_iter(key):
            if not (key or key.strip()):  # we don't allow empty tags
                continue
            tagstr = key.strip().lower()
            category = category.strip().lower() if category is not None else None

            # This does not delete the tag object itself. Maybe it should do
            # that when no objects reference the tag anymore (how to check)?
            tagobj = self.obj.db_tags.filter(db_key=tagstr, db_category=category)
            if tagobj:
                getattr(self.obj, self._m2m_fieldname).remove(tagobj[0])
        self._recache()
:returns: Collection of JSONized Node objects.
dataset/ETHPy150Open evennia/evennia/evennia/typeclasses/tags.py/TagHandler.remove--crossover with--dataset/ETHPy150Open openstack/fuel-web/nailgun/nailgun/extensions/network_manager/handlers/nic.py/NodeNICsHandler.PUT