Don't try to get an Undefined bokeh property #3513
Merged
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Fixes #3512
The
DatePicker
widget has in Panel aparam.CalendarDate
Parameter that allows None, however in the Bokeh model theDate
property isn'tNullable
(which I imagine could be improved). When a PanelDatePicker
is instantiated without definingvalue
, and thenvalue
is set to a date, the Bokeh model doesn't havevalue
yet defined, which causes the error reported in the issue. The suggested change catches the error raised by Bokeh and assumes the property is effectively going to change, since it was not set at all.