Ensure plot_index exists before using it

holoviz / pyviz_comms

Bidirectional communication for the HoloViz ecosystem

BSD 3-Clause "New" or "Revised" License

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Closed philippjfr closed 5 years ago

philippjfr commented 5 years ago

Fixes issue where uncleared notebook can leave window.PyViz.plot_index undefined causing errors when executing cells.