A descriptive error for uninitialized nodes

[kvkarandashev]

I got this error while attempting to pull a tag from hummingqueue:

  File "/home/konstantin/miniconda3/envs/python311/lib/python3.11/site-packages/hmq/hmq.py", line 763, in from_queue
    total = api.get_tag_status(tag)["total"]
            ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/konstantin/miniconda3/envs/python311/lib/python3.11/site-packages/hmq/hmq.py", line 499, in get_tag_status
    "challenge": self._get_challenge(),
                 ^^^^^^^^^^^^^^^^^^^^^
  File "/home/konstantin/miniconda3/envs/python311/lib/python3.11/site-packages/hmq/hmq.py", line 652, in _get_challenge
    self._build_box()
  File "/home/konstantin/miniconda3/envs/python311/lib/python3.11/site-packages/hmq/hmq.py", line 233, in _build_box
    self._url = self._clean_instance(config["server"]["url"])
                                     ~~~~~~^^^^^^^^^^
  File "/home/konstantin/miniconda3/envs/python311/lib/python3.11/configparser.py", line 979, in __getitem__
    raise KeyError(key)
KeyError: 'server'

Jan later explained to me I should copy the ~/.hummingqueue folder to the uninitialized node, and I think it would be better if the instruction appeared somewhere as a result of a failed assert.