message: Default mapping value to indicate failure -1
diff: @@ -1481,6 +1481,7 @@ void FiniteElementSpace::GenerateFaceDofsFromBdr()
  Array<Connection> face_dof_list;
  Array<int> row;
  face_to_be.SetSize(mesh->GetNumFaces());
  + face_to_be = -1;
  for (int b = 0; b < bdrElem_dof->Size(); b++)
  {
  bdrElem_dof->GetRow(b, row);
  