[Openflipper] Invalid face color

Hello,

I'm using .obj for OpenFlipper. Is there any way to tell if a .obj contains face color or not from code?

I found that if I checked "Load Face Colors" in the popup options, has_face_colors() will always return true no matter this .obj contains face color or not. The resulting color is invalid if this .obj does not contains face color. However, I can't tell this from my code.

I would like to run a batch for several .objs that some of them contain face color and some others does not so I can't unchecked this option one by one manualy.

Thanks, MBRSL