title: Empty a UIPageViewController (remove ViewControllers inside)
body: <p>How can I remove all the viewControllers inside a UIPageViewController in Swift?</p>
  
  <p>Those calls:</p>
  
  <pre><code>pageViewController.setViewControllers(nil,....)
  pageViewController.setViewControllers([UIViewController(),....)
  </code></pre>
  
  <p>both make my app crash with the following message:<code>The number of view controllers provided (0) doesn't match the number required (1) for the requested transition</code></p>