[Bf-python] NMesh change breaking old scripts

[Campbell Barton]

Hi, f.col in NMesh used to always return a color, white if there were no 
vcols on the mesh. now it returns an empty list/tuple if theres no 
colors. This breaks old scripts, could we change back?

-- 
Campbell J Barton

133 Hope Street
Geelong West, Victoria 3218 Australia

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