Have ColormapOverlay support blank keys #1432
Merged
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Apply color overlays regardless of the value of the key in the current (top most) layer.
This change aims to maintain backwards compatibility to apply color overlays on lower layers, provided that the top most layer does not specify a color for a key.
Due to limitations of the API, there is no guarantee that the color applied matches the highest layer matching the key except for the top most layer.
Fixes #1425