684dbba6a1
SubdvigCCG is null for the evaluated mesh in the render depsgraph because of the `!for_render` check in `MOD_multires.cc`. But the PBVH type is still `PBVH_GRIDS`. That's a weird inconsistency that ideally wouldn't happen, but probably isn't simple to change. The simplest and most obviously harmless fix is to just check whether the list of PBVH nodes to update is empty.