added default callbacks if not specified

Author: jamesaspence

lib/Local.js

@@ -18,6 +18,9 @@ function Local(){
   this.doneRegex = /Press Ctrl-C to exit/i;
 
   this.start = function(options, callback){
+    if(typeof callback !== 'function')
+      callback = function(){};
+
     this.userArgs = [];
     var that = this;
     this.addArgs(options);
@@ -104,6 +107,9 @@ function Local(){
   };
 
   this.stop = function (callback) {
+    if(typeof callback !== 'function')
+      callback = function(){};
+
     if(!this.pid) return callback();
     this.opcode = 'stop';
     this.tunnel = childProcess.execFile(this.binaryPath, this.getBinaryArgs(), function(error){