title: how to get none empty list from a list of list
body: <p>I have a list which contain a list of list. The structure looks like this:
  <a href="https://i.stack.imgur.com/qNtp7.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/qNtp7.png" alt="enter image description here" /></a></p>
  <p>Is it possible to create a with none empty list of list in it?</p>
  <p>I tried <code>datalist2 &lt;- datalist[!is.na(datalist[[]])]</code>  which return 0 list, and <code>datalist2 &lt;- datalist[!is.na(datalist[[]])]</code> whih return 5 lists(no changes). How can I only get 3 lists?</p>
  <p>Any suggestion?</p>