Initializing manager property with provided attribute reference

Author: pavle-goloskokovic

src/sound/noaudio/NoAudioSound.js

@@ -4,6 +4,7 @@ var NoAudioSound = new Class({
     Extends: EventEmitter,
     initialize: function NoAudioSound(manager, key, config) {
         EventEmitter.call(this);
+        this.manager = manager;
     }
 });
 module.exports = NoAudioSound;