Fire Range `updated` event when data sources are set to empty

enthought / chaco

Chaco is a Python package for building interactive and custom 2-D plots.

http://docs.enthought.com/chaco/

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Closed corranwebster closed 1 year ago

corranwebster commented 1 year ago

The updated event on a DataRange1D was not being fired when the last data source was removed. This fixes that.

Fixes #821