Fix #138790: Crash applying empty geometry node modifier on point cloud

Copying the point cloud is basically free in the scheme of things.
Better to do that than check if the output point cloud is the same.

source/blender/editors/object/object_modifier.cc

@@ -1203,7 +1203,7 @@ static bool modifier_apply_obdata(ReportList *reports,
     }
 
     bke::GeometrySet geometry_set = bke::GeometrySet::from_pointcloud(
-        &points, bke::GeometryOwnershipType::ReadOnly);
+        BKE_pointcloud_copy_for_eval(&points));
 
     ModifierEvalContext mectx = {depsgraph, ob, MOD_APPLY_TO_ORIGINAL};
     mti->modify_geometry_set(md_eval, &mectx, &geometry_set);