Fix #36719: UV pass not rendering in second render layer if first render layer does not have the UV pass enabled as well.
Fix #36719: UV pass not rendering in second render layer if first render layer
does not have the UV pass enabled as well.

tangent-opensource/coreBlackbird,pyrochlore/cycles,pyrochlore/cycles,tangent-opensource/coreBlackbird,tangent-opensource/coreBlackbird,pyrochlore/cycles