Close video player on resume with invalid state

In some cases the video player may be stopped when the activity is paused. This ends up crashing the app on resume. Check for this kind of invalid state and close the video player to prevent crashing.

app/src/main/java/org/jellyfin/androidtv/ui/playback/CustomPlaybackOverlayFragment.java

@@ -728,6 +728,17 @@ private void startFadeTimer() {
     public void onResume() {
         super.onResume();
 
+        // Close player when resuming without a valid playback contoller
+        if (!mPlaybackController.hasFragment()) {
+            if (navigationRepository.getValue().getCanGoBack()) {
+                navigationRepository.getValue().goBack();
+            } else {
+                navigationRepository.getValue().reset(Destinations.INSTANCE.getHome());
+            }
+
+            return;
+        }
+
         // Hide system bars
         WindowCompat.setDecorFitsSystemWindows(requireActivity().getWindow(), false);
         WindowCompat.getInsetsController(requireActivity().getWindow(), requireActivity().getWindow().getDecorView()).hide(WindowInsetsCompat.Type.systemBars());