Blender Git Loki

Fix export image generated by export UV layout

Was only happening with new dependency graph.

The issue here is that scene's depsgraph layers will be 0 unless
it was ever visible. Worked around by checking for 0 layer in the
update_tagged of new depsgraph. This currently kind of following
logic of visible_layers, but is weak.

Committing so studio is unlocked here, will re-evaluate this layer.