Batching - blank UVs in polys that contain no UVs
Batching - blank UVs in polys that contain no UVs

Polys that have no texture assigned contain no UVs in the poly command. These were previously not blanked, leading to random values if read from a custom shader.

This PR just blanks them.

ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot