title: Objectify - The list from query result contains null
body: <p>When I try below code, "result" contains null.</p>
  
  <pre><code>    Collection&lt;Data&gt; result = ObjectifyService.ofy().load().type(Data.class).list();
  </code></pre>
  
  <p>result.size() is not zero.</p>
  
  <p>What is the reason for containing null in "result"?</p>