Error fix : handle logout process in HomePage

lib/blocs/user/user_event.dart

@@ -14,7 +14,9 @@ class UserUpdated extends UserEvent {
   UserUpdated(this.userData);
 }
 
-class UserLoggedOut extends UserEvent {}
+class UserLoggedOut extends UserEvent {
+  UserLoggedOut();
+}
 class LoadUser extends UserEvent {
   final String userId;