CollectionView no longer respects emptyView defined on the View.

This breaks the documented functionality http://emberjs.com/api/classes/Ember.CollectionView.html :
```js
App.ListWithNothing = Ember.CollectionView.extend({
  classNames: ['nothing']
  content: null,
  emptyView: Ember.View.extend({
    template: Ember.Handlebars.compile("The collection is empty")
  })
});
```

This does still work if you pass the `emptyView` as an argument via handlebars collection helper

```
{{#collection App.ListView emptyViewClass="App.EmptyView"}} ... {{/collection}}
```

And the `{{else}}` still works.

This updates the unit test to show the failure.