title: UIViewController not presented from AppDelegate
body: <p>I am trying to present a sign up/ log in ViewController if the user is not instantiated yet, but for some reason the ViewController does not want to present itself, it is presenting a black page with nothing on it. This is what I have in my <code>AppDelegate.swift</code> file, and it should present the ViewController if the user has not signed up yet (which I have not), I set a break point in the VC's <code>ViewDidLoad()</code> which does not hit. Anyone have an idea of what's going wrong?</p>
  
  <pre><code>var window: UIWindow?
  
      func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -&gt; Bool {
          // Override point for customization after application launch.
          FirebaseApp.configure()
  
          if Auth.auth().currentUser == nil {
              let storyboard = UIStoryboard(name: "Main", bundle: Bundle.main)
              let authVC = storyboard.instantiateViewController(identifier: "AuthVC")
              window?.makeKeyAndVisible()
              window?.rootViewController?.present(authVC, animated: true, completion: nil)
  
          }
          return true
      }
  </code></pre>