title: Firebase collection becomes an array with null in Firebase JSON API
body: <p>I have a Firebase collection that looks like this:</p>
  
  <p><a href="https://i.stack.imgur.com/UlUKx.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/UlUKx.png" alt="screens collection"></a></p>
  
  <p>Source: <a href="https://weld-development-tom.firebaseio.com/projects/5649ddc3f709a10c003cf031/screens" rel="nofollow noreferrer">https://weld-development-tom.firebaseio.com/projects/5649ddc3f709a10c003cf031/screens</a> (need auth)</p>
  
  <p>But when I request it over the Firebase JSON API, it looks like this:</p>
  
  <pre><code>[
    null,
    {
      "dateUpdated" : 1454489265605,
      "elements" : { /* removed to make question shorter */ },
      "name" : "Screen 1",
      "slug" : "screen-1"
    }
  ]
  </code></pre>
  
  <p>Source: <a href="https://weld-development-tom.firebaseio.com/projects/5649ddc3f709a10c003cf031/screens.json?print=pretty" rel="nofollow noreferrer">https://weld-development-tom.firebaseio.com/projects/5649ddc3f709a10c003cf031/screens.json?print=pretty</a></p>
  
  <p>How can I get the real <code>screens</code> collection through the JSON API?</p>