let .snapshot() not return None. Use stub image if no array data.

vispy / jupyter_rfb

Remote Frame Buffer for Jupyter

https://jupyter-rfb.readthedocs.io

MIT License

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let .snapshot() not return None. Use stub image if no array data. #40

Closed almarklein closed 3 years ago

almarklein commented 3 years ago

Addendum to #37. The .snapshot() method would return None if get_frame() would return None, but it is confusing when this happens. Better generate a stub 1px gray image instead.