Node action api issue

```
[2022-10-05 11:58:08,344: ERROR/MainProcess] Task tasks.common_worker.common_worker[e0d82f8b-bed7-4d50-96bf-3fa0fb30b44f] raised unexpected: TypeError('the JSON object must be str, bytes or bytearray, not NoneType')
Traceback (most recent call last):
File "/usr/local/lib/python3.9/site-packages/celery/app/trace.py", line 451, in trace_task
R = retval = fun(*args, **kwargs)
File "/usr/local/lib/python3.9/site-packages/celery/app/trace.py", line 734, in __protected_call__
return self.run(*args, **kwargs)
File "/app/code/tasks/common_worker.py", line 32, in common_worker
run_node_task(kwargs["action"], kwargs["node_action_details"])
File "/app/code/tasks/task_scheduler.py", line 335, in run_node_task
image_dict = json.loads(image_list_details_str)
File "/usr/local/lib/python3.9/json/__init__.py", line 339, in loads
raise TypeError(f'the JSON object must be str, bytes or bytearray, '
TypeError: the JSON object must be str, bytes or bytearray, not NoneType

```