title: if localStorage key value doesn't exist
body: <p>I am trying to hide my div if there is no a localStorage key value. </p>
  
  <p>With the line below I achieved only to hide a div when localStorage key completely deleted but need to do the same if localStorage <strong>key hasn't got any value</strong> at all just [].</p>
  
  <pre><code> window.localStorage.getItem('items') === null
  </code></pre>
  
  <p>How would it be performed?</p>