Calling Tween.setCallback() without specifying the params argument would cause an error invoking the callback params. This parameter is now fully optional. Fix #6047

src/tweens/tween/Tween.js

@@ -1008,6 +1008,8 @@ var Tween = new Class({
      */
     setCallback: function (type, callback, params, scope)
     {
+        if (params === undefined) { params = []; }
+
         this.callbacks[type] = { func: callback, scope: scope, params: [ this, null ].concat(params) };
 
         return this;