title: Handling an empty UITableView. Print a friendly message
body: <p>I have a UITableView that in some cases it is legal to be empty. So instead of showing the
  background image of the app, I would prefer to print a friendly message in the screen, such as:</p>
  
  <blockquote>
    <p>This list is now empty</p>
  </blockquote>
  
  <p>What is the simplest way to do it? </p>