Objectdb now fetch used defined tags only if object is attached to an account.

        parent = obj.get('__parent')

        if parent is None:

            if 'a' in obj:

                user_tags = self._server.conf.show(obj['id'])['tags']

                obj['__user_defined_tags'] = user_tags

            else:

                user_tags = {}

                obj['__user_defined_tags'] = {}

            client_id = obj['id']

        else:

            user_tags = parent['__user_defined_tags']