message: Fix a bunch of bond tests
diff: @@ -429,6 +429,7 @@ Molecule::BondType Molecule::addBond(Index atom1, Index atom2,
  }
  m_bondPairs.push_back(Molecule::makeBondPair(atom1, atom2));
  m_bondOrders.push_back(order);
  + index = static_cast<Index>(m_bondPairs.size() - 1);
  } else {
  m_bondOrders[index] = order;
  }
  