fix: Emote settings and discovery fallback

lib/config/routes.dart

@@ -162,8 +162,8 @@ class FluffyRoutes {
                 return ViewData(
                   leftView: (_) => Settings(),
                   mainView: (_) => EmotesSettings(
-                    room: (settings.arguments as Map)['room'],
-                    stateKey: (settings.arguments as Map)['stateKey'],
+                    room: ((settings.arguments ?? {}) as Map)['room'],
+                    stateKey: ((settings.arguments ?? {}) as Map)['stateKey'],
                   ),
                 );
               case 'ignore':

lib/views/discover_view.dart

@@ -132,7 +132,7 @@ class _DiscoverPageState extends State<DiscoverPage> {
     }).then((PublicRoomsResponse res) {
       if (widget.alias != null &&
           !res.chunk.any((room) =>
-              room.aliases.contains(widget.alias) ||
+              (room.aliases?.contains(widget.alias) ?? false) ||
               room.canonicalAlias == widget.alias)) {
         // we have to tack on the original alias
         res.chunk.add(PublicRoom.fromJson(<String, dynamic>{