message: Adding warning for spc's that reference nodes that don't exist in bdf
diff: @@ -463,7 +463,15 @@ class pyMeshLoader(BaseUI):
  for spc in self.bdfInfo.spcs[spc_id]:
  # Loop through every node specifed in this spc and record bc info
  for j, nastranNode in enumerate(spc.nodes):
  + # If constrained node doesn't exist in bdf
  + if nastranNode not in self.bdfInfo.node_ids:
  + self._TACSWarning(f'Node ID {nastranNode} (Nastran ordering) is referenced by an SPC, '
  + 'but the node was not defined in the BDF file. Skipping SPC.')
  + continue
  +
  + # Convert to TACS node ID
  tacsNode = self.idMap(nastranNode, self.nastranToTACSNodeIDDict)
  +
  # If node hasn't been added to bc dict yet, add it
  if tacsNode not in bcDict:
  bcDict[tacsNode] = {}
  