me method Null safety

Implementation

@override
Future<User?> me() async {
  Redditor? me = await _reddit.user.me();
  if (me == null) {
    return null;
  }
  return User(
      name: me.displayName,
      description: me.data?["subreddit"]["description"] ?? "",
      iconUrl: HtmlUnescape().convert(me.data!["icon_img"] as String)
  );
}