Create transaction if not supplied in transaction message.

lib/messages/commands/tx.js

@@ -23,6 +23,9 @@ function TransactionMessage(arg, options) {
     'An instance of Transaction or undefined is expected'
   );
   this.transaction = arg;
+  if (!this.transaction) {
+    this.transaction = new this.Transaction();
+  }
 }
 inherits(TransactionMessage, Message);
 

lib/messages/commands/version.js

@@ -5,7 +5,6 @@ var inherits = require('util').inherits;
 var bitcore = require('bitcore');
 var BufferWriter = bitcore.encoding.BufferWriter;
 var BufferReader = bitcore.encoding.BufferReader;
-var _ = bitcore.deps._;
 var BN = bitcore.crypto.BN;
 
 var utils = require('../utils');

test/messages/commands/index.js

@@ -31,6 +31,11 @@ describe('Command Messages', function() {
       message.transaction.should.be.instanceof(bitcore.Transaction);
     });
 
+    it('should create a transaction instance', function() {
+      var message = messages.Transaction();
+      message.transaction.should.be.instanceof(bitcore.Transaction);
+    });
+
     it('version should remain the same', function() {
       var tx = new bitcore.Transaction();
       var version = Number(tx.version);