title: if binding without container element not working for sortable
body: <p>I modified a JSFiddle from rniemeyer to illustrate the problem: <a href="http://jsfiddle.net/mTqMt/1/" rel="nofollow">http://jsfiddle.net/mTqMt/1/</a></p>
  
  <pre><code>  &lt;div class="container" data-bind="sortable: groupOrItems"&gt;
      &lt;!--ko if: type=='Group'--&gt;
      &lt;div&gt;
        &lt;div class="title" data-bind="text: name()"&gt;&lt;/div&gt;
        &lt;!--here I would actually have a nested sortable--&gt;
      &lt;/div&gt;
      &lt;!--/ko--&gt;
      &lt;!--ko if: type=='Item'--&gt;
      &lt;div class="item" data-bind="text: name()"&gt;&lt;/div&gt;
      &lt;!--/ko--&gt;
    &lt;/div&gt;
  </code></pre>
  
  <p>Firebug says: "TypeError: node is null" line 546 in knockout-latest.debug.js</p>
  
  <p>I tried it with "foreach" instead of "sortable" and then it worked.</p>
  
  <p>Any ideas?</p>