message: Require residues for cartoon display
  Prevents non-peptides from showing cartoons
diff: @@ -364,7 +364,8 @@ void Cartoons::process(const Molecule& molecule, Rendering::GroupNode& node)
  backbones = getBackboneByResidues(molecule, layer);
  }
  if (backbones.size() == 0) {
  - backbones = getBackboneManually(molecule, layer);
  + return;
  + // backbones = getBackboneManually(molecule, layer);
  }
  size_t i = 0;
  for (const auto& group : backbones) {
  