To refresh colors F-Curves I have to display the Graph editor on the screen. Blender doesn't refresh colors F-Curves automatically.
Create some animation with the default cube and follow:
without display the Graph editor on the screen, we get a pure black color:
Color((0.0, 0.0, 0.0))
It the any way to refresh and update colors F-Curves via python ?
Below a screenshot from Outliner, Datablocks.