get network from first output when multiple outputs in proposal

lib/model/txproposal.js

@@ -157,7 +157,8 @@ TxProposal.prototype.getBitcoreTx = function() {
 };
 
 TxProposal.prototype.getNetworkName = function() {
-  return Bitcore.Address(this.toAddress).toObject().network;
+  var someAddress = this.toAddress || this.outputs[0].toAddress;
+  return Bitcore.Address(someAddress).toObject().network;
 };
 
 TxProposal.prototype.getRawTx = function() {