##// END OF EJS Templates
avoid unregistering widget model twice...
avoid unregistering widget model twice widgets are registered when the comm is created; closing unregisters them. Calling `close` a second time should be a no-op.

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v4-test.ipynb
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Invalid Notebook!

{'cell_type': 'heading', 'level': 1, 'metadata': {}, 'source': 'nbconvert latex test'} is not valid under any of the given schemas Failed validating 'oneOf' in heading_cell['properties']['cells']['items']: On instance['cells'][0]: {'cell_type': 'heading', 'level': 1, 'metadata': {}, 'source': 'nbconvert latex test'}