title: request Facebook friends return empty
body: <p>I have two Facebook accounts(friends) and I logged in and authorized my app in both.
  But when I try to request friends from any of them I get an empty list.
  Can this be related to the fact that my app still in development?</p>
  
  <p>granted permissions = [AnyHashable("user_friends"), AnyHashable("contact_email"), AnyHashable("email"), AnyHashable("public_profile"), AnyHashable("user_birthday")]</p>
  
  <p>my code:</p>
  
  <pre><code>FBSDKGraphRequest(graphPath: "/me/friends", parameters: nil).start(completionHandler: { (connection, user, requestError) -&gt; Void in
          let userData = user as! NSDictionary
          let friends = userData["data"] as? String
  
          if requestError != nil {
              print(requestError)
              return
          }
  
          print(friends) // prints nil
  })
  </code></pre>
  
  <p>Im using Swift 3</p>