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Resource scheduler may get an empty request about available nodes

2023-07-11 21:19:45,511 (init.py:148) root ERROR> Uncaught exception

Traceback (most recent call last):
  File "/home/gitlab-runner/builds/Ei-uk5TxX/0/verification/klever/venv/bin/klever-native-scheduler", line 8, in <module>
    sys.exit(native_scheduler())
  File "/home/gitlab-runner/builds/Ei-uk5TxX/0/verification/klever/venv/lib/python3.10/site-packages/klever/scheduler/main.py", line 56, in native_scheduler
    scheduler_impl = Scheduler(conf, logger, "scheduler/", native.Native)
  File "/home/gitlab-runner/builds/Ei-uk5TxX/0/verification/klever/venv/lib/python3.10/site-packages/klever/scheduler/schedulers/__init__.py", line 111, in __init__
    self.init_scheduler()
  File "/home/gitlab-runner/builds/Ei-uk5TxX/0/verification/klever/venv/lib/python3.10/site-packages/klever/scheduler/schedulers/__init__.py", line 135, in init_scheduler
    self.runner.init()
  File "/home/gitlab-runner/builds/Ei-uk5TxX/0/verification/klever/venv/lib/python3.10/site-packages/klever/scheduler/schedulers/native.py", line 95, in init
    self.update_nodes(self.conf["scheduler"].get("wait controller initialization", False))
  File "/home/gitlab-runner/builds/Ei-uk5TxX/0/verification/klever/venv/lib/python3.10/site-packages/klever/scheduler/schedulers/native.py", line 175, in update_nodes
    cancel_jobs, cancel_tasks = self._manager.update_system_status(self._kv_url, wait_controller)
  File "/home/gitlab-runner/builds/Ei-uk5TxX/0/verification/klever/venv/lib/python3.10/site-packages/klever/scheduler/schedulers/resource_scheduler.py", line 98, in update_system_status
    node_status = json.loads(consul_client.kv_get("states/" + node))
  File "/opt/usr/local/python3.10-klever/lib/python3.10/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