def userLeftRoom(self, room, user):
        pass
created_by should not be changed when updating a group.
dataset/ETHPy150Open ralphm/wokkel/wokkel/muc.py/MUCClient.userLeftRoom--crossover with--dataset/ETHPy150Open ofa/connect/open_connect/groups/tests/test_views.py/GroupUpdateViewTest.test_created_by_is_not_updated