Fix update group API endpoint

            self._check_duplicated_group_name(sa_session, name)

            group.name = name

            sa_session.add(group)

        user_ids = payload.user_ids or []

        users = get_users_by_ids(sa_session, user_ids)

        role_ids = payload.role_ids or []

        roles = get_roles_by_ids(sa_session, role_ids)

        self._app.security_agent.set_entity_group_associations(

            groups=[group], roles=roles, users=users, delete_existing_assocs=False

        )

        users = None

        if payload.user_ids is not None:

            users = get_users_by_ids(sa_session, payload.user_ids)

        roles = None

        if payload.role_ids is not None:

            roles = get_roles_by_ids(sa_session, payload.role_ids)

        if payload.user_ids is not None or payload.role_ids is not None:

            self._app.security_agent.set_entity_group_associations(groups=[group], roles=roles, users=users)

        with transaction(sa_session):

            sa_session.commit()