message: tweak hasStructConnRecord
diff: @@ -261,6 +261,8 @@ function computeInterUnitBonds(structure: Structure, props?: Partial<InterBondCo
  }
  function hasStructConnRecord(unit: Unit) {
  + if (!Unit.isAtomic(unit)) return false;
  +
  const elements = unit.elements;
  const structConn = StructConn.Provider.get(unit.model);
  if (structConn) {
  