Blender Git Loki

Fix T75089: Missing pmap when using Face Sets in the mesh filter

When using Face Sets to mask the mesh filter the pmap needs to be
initialized to check the face sets of each vertex, otherwise it will
crash because it is null.

Probably now we should just initalize the pmap when building the PBVH as
almost all tools need it, so we can avoid these crashes in the future.

Reviewed By: jbakker

Maniphest Tasks: T75089

Differential Revision: https://developer.blender.org/D7236