Before this it was possible to use the operator with Dyntopo sample mode with a PBVH type GRIDS or FACES, causing a crash. Now we check first if the PBVH type is correct before calling the sampling function. We also check if the PBVH exists, which may also cause a crash. Reviewed By: jbakker Maniphest Tasks: T72647 Differential Revision: https://developer.blender.org/D6475