.get instead of acessing attr

[hamelsmu]

I get the error when I create a new repo and save any notebook

[E 2022-09-09 11:37:30.031 ServerApp] Pre-save hook failed on Untitled.ipynb
    Traceback (most recent call last):
      File "/Users/hamel/opt/anaconda3/lib/python3.9/site-packages/jupyter_server/services/contents/manager.py", line 134, in run_pre_save_hook
        self.pre_save_hook(model=model, path=path, contents_manager=self, **kwargs)
      File "/Users/hamel/.jupyter/jupyter_server_config.py", line 4, in nbdev_clean_jupyter
        clean_jupyter(**kwargs)
      File "/Users/hamel/github/nbdev/nbdev/clean.py", line 146, in clean_jupyter
        jupyter_hooks = get_config(path=path).get('jupyter_hooks')
      File "/Users/hamel/github/fastcore/fastcore/foundation.py", line 269, in __getattr__
        def __getattr__(self,k):   return stop(AttributeError(k)) if k=='d' or k not in self.d else self.get(k)
      File "/Users/hamel/github/fastcore/fastcore/basics.py", line 216, in stop
        raise e
    AttributeError: jupyter_hooks

On further investigation, it appears that cfg._apply_defaults is not applying a default because mysteriously cfg.get('jupyter_hooks') is returning False, even though I have no user level configs. What is even more mysterious is that

cfg.get('jupyter_hooks') returns False
but cfg.jupyter_hooks raises an AttributeError

I have no idea where the False is coming from either, but that is a separate issue.

This is a repo I created this morning and it failed on that

[review-notebook-app]

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