Make .address a property such that if it's null it'll error.

[tcoulter]

This will throw errors up front, like in this migration, for instance:

module.exports = function(deployer) {
  deployer.deploy([
    Mutex,
    Owned,
    Mortal,
    ExternalStorage,    
    [ForexDB, ExternalStorage.address],
    OrderDB,    
    [DepositDB, ExternalStorage.address],
    [Exchanger, ForexDB.address, OrderDB.address, DepositDB.address],
  ]);
};

This eventually leads to an error deep within the .sol.js file because .address is null in all cased above.

[tcoulter]

Ensure this is no longer a problem with truffle-contract.