The Theme editor should show the parser error when an invalid color is used

I was confused when my dashboard preview would bounce back to the dashboard editor. I only discovered that the theme color I picked was invalid when I checked my terminal and found the following warning:

This would probably be solved when we move to one common Editor that's used for all resources. The common Editor will display reconcile/parse errors for the current file.

@ericpgreen2 if it will be solved by the common editor it feels like we can defer this until the common editor lands?

@ericpgreen2 if it will be solved by the common editor it feels like we can defer this until the common editor lands?

Agree, this one isn't critical, just further motivation to refactor to a common Editor.