title: Sightly: check for empty lists
body: <p>Using <code>data-sly-list</code> I can iterate over a list object in Sightly, but how can I check if a list is empty? <code>data-sly-list</code> simply renders nothing on empty list objects and I need to display an alternativ text if the list contains no items.</p>
  
  <p>Thanks</p>