title: Emberjs app initialize fail when creating ArrayController
body: <p>When I try to initialize my ember App with an ArrayController I got an issue but only when ember-data is added to the project. Here's a quick example at <a href="http://jsfiddle.net/ySmZr/2/" rel="nofollow">http://jsfiddle.net/ySmZr/2/</a></p>
  
  <pre><code>App = Em.Application.create();
  App.customerController = Em.ArrayController.create({});
  App.initialize();​
  </code></pre>
  
  <p>return the following error :</p>
  
  <pre><code>Uncaught TypeError: Cannot call method 'get' of undefined  (ember-data-latest.js:3693)
  </code></pre>
  
  <p>Without ember-data I got no error. I looked everywhere and I just can't find why ember is acting like this... Any idead ? Thanks !</p>