title: Using Ember.Select bound to an ArrayController that has an itemController
body: <p>I have an <strong>Ember.Select</strong> view that has a contentBinding to an ArrayController.  When I set an itemController on the ArrayController, it suddenly throws this error:
  <strong>Uncaught TypeError: Cannot call method 'child' of null</strong></p>
  
  <p>Here is a minimalist example:</p>
  
  <pre><code>&lt;script type="text/x-handlebars" data-template-name="application"&gt;
      {{view Ember.Select viewName="select"
                      contentBinding="App.monstersController"
                      optionLabelPath="content.name"
                      optionValuePath="content.id"
                      prompt="Pick a monster:"
                      selectionBinding="App.stateController.selectedMonster"}}
  
  &lt;/script&gt;
  </code></pre>
  
  <p>And the javascript:</p>
  
  <pre><code>window.App = Em.Application.create();
  
  App.ApplicationController = Em.Controller.extend({});
  
  App.ApplicationView = Em.View.extend({
      templateName: 'application'
  });
  
  App.data = [{
      id: 1,
      name: "Grog",
      strength: 10,
      species: "Troll"
  }, {
      id: 2,
      name: "Ognog",
      strength: 8,
      species: "Goblin"
  }, {
      id: 3,
      name: "Fred",
      strength: 3,
      species: "Human"
  }];
  
  App.stateController = Em.Controller.create({
      selectedMonster: null
  });
  
  App.MonsterController = Em.ObjectController.extend({
      name: function() {
          return "Controller Modified " + this.get('name');
      }.property('content.name')
  });
  
  App.MonstersController = Em.ArrayController.extend({
      content: App.data/*,
      itemController: "monster"*/
  });
  
  App.monstersController = App.MonstersController.create({});
  </code></pre>
  
  <p>Here is a fiddle, demonstrating the problem:
  <a href="http://jsfiddle.net/Malkyne/AkHhF/" rel="nofollow">http://jsfiddle.net/Malkyne/AkHhF/</a></p>
  
  <p>Does anyone have any idea what is going on here, or how I can fix it?</p>