更新bug

Controller/UnicomCombo/UnicomComboController.py

@@ -225,7 +225,7 @@ class UnicomComboView(View):
                     sys_msg_qs = SysMsgModel.objects.filter(uid=serial_no)
                     if sys_msg_qs.exists():
                         sys_msg_qs.delete()
-                    device_info_qs.update(status=1, updated_time=now_time, user_id=None)
+                    device_info_qs.update(status=1, updated_time=now_time, user_id='')
 
                     combo_order_qs = UnicomComboOrderInfo.objects.filter(iccid=iccid)
                     if combo_order_qs.exists():