Merge branch 'generic-part-bdry' into mpi-distribute

Author: majosm

meshmode/mesh/__init__.py

@@ -1072,15 +1072,11 @@ def set_if_not_present(name, from_name=None):
 
     @property
     def ambient_dim(self):
-        if not self.groups:
-            return None
         from pytools import single_valued
         return single_valued(grp.nodes.shape[0] for grp in self.groups)
 
     @property
     def dim(self):
-        if not self.groups:
-            return None
         from pytools import single_valued
         return single_valued(grp.dim for grp in self.groups)
 

meshmode/mesh/processing.py

@@ -134,8 +134,8 @@ def _filter_mesh_groups(mesh, selected_elements, vertex_id_dtype):
     filtered_group_elements = []
     for igrp in range(len(mesh.groups)):
         start_idx, end_idx = group_elem_starts[igrp:igrp+2]
-        if end_idx == start_idx:
-            continue
+        # if end_idx == start_idx:
+        #     continue
 
         new_group_to_old_group.append(igrp)
         filtered_group_elements.append(