message: Removed unnecessary check
  Override in NVSceneController (return nil) stops it going into swizzled method
diff: - (UIViewController *)navigation_childViewControllerForStatusBarStyle
  {
  - if ([self isKindOfClass:[NVSceneController class]])
  - return nil;
  NVNavigationStackView *stack = (NVNavigationStackView *) [self.view viewWithTag:NAVIGATION_STACK];
  return [stack.navigationController presentedViewController] ?: [stack.navigationController topViewController];
  }
  