title: Apache Zeppelin, Deleted notebook
body: <p>I've restarted my Apache Zeppelin after an accidental close.
  I don't see my notebook on the Home screen :o!!
  When I list the notebook directory on the terminal, I see several codes for directories. One of them corresponds to my lost notebook, but when I list the files contained (note.json) ..it has 0 bytes.</p>
  
  <p>It's very important to recover this notebook.
  Can anyone help me?
  Thanks in advance.</p>