[BUG] `%%graph_notebook_config` sometimes fails when Gremlin section is excluded

[michaelnchin]

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Describe the bug

When attempting to run %%graph_notebook_config on graph-notebook>=4.4.1 with a non-Neptune host and all other required fields, a KeyError is returned returned. This error appears related to the gremlin config sub-section, which should be an optional parameter.

Full error trace:

Traceback (most recent call last):
  File "/Users/chnmch/.pyenv/versions/3.10.13/envs/itables-cache-test-3/lib/python3.10/site-packages/graph_notebook/decorators/decorators.py", line 80, in do_display_exceptions
    return func(*args, **kwargs)
  File "/Users/chnmch/.pyenv/versions/3.10.13/envs/itables-cache-test-3/lib/python3.10/site-packages/graph_notebook/magics/graph_magic.py", line 457, in graph_notebook_config
    data = json.loads(cell)
  File "/Users/chnmch/.pyenv/versions/3.10.13/lib/python3.10/json/__init__.py", line 346, in loads
    return _default_decoder.decode(s)
  File "/Users/chnmch/.pyenv/versions/3.10.13/lib/python3.10/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/Users/chnmch/.pyenv/versions/3.10.13/lib/python3.10/json/decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 4 column 12 (char 55)