[BUG] Selecting color palette with incompatible levels/name

[andrewgryan]

KeyError raised if dropdown menu selects incompatible combinations of palette name and levels

[andrewgryan]

Opportunity to redesign the double-dropdown UI to something more intuitive.

[github-actions]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 5 days.