title: JCE 2.8.3 error: "The server returned an invalid JSON response"
body: <p>Recently I have updated the JCE editor from 2.8.2 to 2.8.3.</p>
  <p>When I try to upload content from the JCE file browser, it is throwing an error saying:</p>
  <blockquote>
  <p>The server returned an invalid JSON response.</p>
  </blockquote>
  <p>Seems the file is getting uploaded but the error is been thrown. Everything was working fine in the previous version 2.8.2.</p>