message: Initialize relations first in UnstructuredMesh::initialize()
diff: @@ -1899,6 +1899,14 @@ private:
  */
  void initialize()
  {
  + m_cell_node_rel = CellToNodeRelation(&m_cells, &m_nodes);
  + m_cell_face_rel = CellToFaceRelation(&m_cells, &m_faces);
  + m_face_cell_rel = FaceToCellRelation(&m_faces, &m_cells);
  + m_face_node_rel = FaceToNodeRelation(&m_faces, &m_nodes);
  +
  + updateNodes();
  + updateCellRelations();
  +
  m_explicit_coords = true;
  m_explicit_connectivity = true;
  m_mesh_fields[NODE_CENTERED]->setResizeRatio(getNodeResizeRatio());
  @@ -1912,13 +1920,6 @@ private:
  m_mesh_fields[NODE_CENTERED]->resize(getNumberOfNodes());
  m_mesh_fields[CELL_CENTERED]->resize(getNumberOfCells());
  m_mesh_fields[FACE_CENTERED]->resize(getNumberOfFaces());
  -
  - m_cell_node_rel = CellToNodeRelation(&m_cells, &m_nodes);
  - m_cell_face_rel = CellToFaceRelation(&m_cells, &m_faces);
  - m_face_cell_rel = FaceToCellRelation(&m_faces, &m_cells);
  - m_face_node_rel = FaceToNodeRelation(&m_faces, &m_nodes);
  -
  - updateCellRelations();
  }
  void updateNodes() { m_nodes = NodeSet(m_coordinates->numNodes()); }
  