fix build

app/serializers/listable_topic_serializer.rb

@@ -43,17 +43,22 @@ class ListableTopicSerializer < BasicTopicSerializer
     return nil unless object.user_data
     object.user_data.last_read_post_number
   end
-  alias :include_last_read_post_number? :seen
+
+  def has_user_data
+    !!object.user_data
+  end
+
+  alias :include_last_read_post_number? :has_user_data
 
   def unread
     unread_helper.unread_posts
   end
-  alias :include_unread? :seen
+  alias :include_unread? :has_user_data
 
   def new_posts
     unread_helper.new_posts
   end
-  alias :include_new_posts? :seen
+  alias :include_new_posts? :has_user_data
 
   def include_excerpt?
     pinned

app/serializers/topic_list_item_serializer.rb

@@ -13,7 +13,7 @@ class TopicListItemSerializer < ListableTopicSerializer
   def starred
     object.user_data.starred?
   end
-  alias :include_starred? :seen
+  alias :include_starred? :has_user_data
 
   def posters
     object.posters || []