title: No files included in stash exception
body: <p>I am using <code>stash</code> command in <code>groovy</code> script. I am getting:</p>
  
  <pre><code>Caught: hudson.AbortException: No files included in stash
  </code></pre>
  
  <p>However the logs before the exception says:</p>
  
  <pre><code>Stashed 1 file(s)
  [Pipeline] stash
  Stashed 1 file(s)
  </code></pre>
  
  <p>can you please advise</p>