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Dash's default is for dropdowns to be clearable by clicking the little "x",
and when they are clear the handler sees
None
, and since we don't handle that, there's an error.I began with the windrose, and confirmed this change fixes the errors there. It seems relatively safe,
so I went ahead and applied it to all the other pull downs as well, though I have not manually checked each one.
https://dash.plotly.com/dash-core-components/dropdown#dropdown-clear