title: EXT js model.load returning undefined record
body: <p>I am doing a Model.load similar to this:</p>
  
  <pre><code>//get a reference to the User model class
  var User = Ext.ModelManager.getModel('User');
  
  //Uses the configured RestProxy to make a GET request to /users/123
  User.load(123, {
      success: function(user) {
          console.log(user.getId()); //logs 123
      }
  
  });
  </code></pre>
  
  <p>In the console I can see that the correct <code>User</code> object is being loaded. The correct server side web service is being called. It is going into the success function. However the <code>user</code> is undefined. Does anyone know why this would happen?</p>