title: BlueImp silently fails on file upload
body: <p>When i try to upload using blueImp, i get the fllowing error when I open up the console:</p>
  
  <pre><code>Uncaught TypeError: Cannot read property 'parseMetaData' of undefined
  </code></pre>
  
  <p>accompanied by a stack trace. It seems I am calling the upload logic without a file. Is there a way I can get more information?</p>