Removed unused NOOP import

Author: pavle-goloskokovic

src/sound/noaudio/NoAudioSound.js

@@ -1,7 +1,6 @@
 var Class = require('../../utils/Class');
 var EventEmitter = require('eventemitter3');
 var Extend = require('../utils/object/Extend');
-var NOOP = require('../../utils/NOOP');
 var BaseSound = require('../BaseSound');
 var NoAudioSound = new Class({
     Extends: EventEmitter,