FIX: Couldn't access "Uncategorized" category from category list.

app/serializers/category_detailed_serializer.rb

@@ -9,7 +9,8 @@ class CategoryDetailedSerializer < ApplicationSerializer
              :topics_week,
              :topics_month,
              :topics_year,
-             :description
+             :description,
+             :is_uncategorized
 
   has_many :featured_users, serializer: BasicUserSerializer
   has_many :featured_topics, serializer: CategoryTopicSerializer, embed: :objects, key: :topics
@@ -26,4 +27,12 @@ class CategoryDetailedSerializer < ApplicationSerializer
     object.topics_year || 0
   end
 
+  def is_uncategorized
+    name == SiteSetting.uncategorized_name
+  end
+
+  def include_is_uncategorized?
+    is_uncategorized
+  end
+
 end

app/serializers/site_serializer.rb

@@ -2,7 +2,8 @@ class SiteSerializer < ApplicationSerializer
 
   attributes :default_archetype,
              :notification_types,
-             :post_types
+             :post_types,
+             :uncategorized_slug
 
   has_many :categories, serializer: BasicCategorySerializer, embed: :objects
   has_many :post_action_types, embed: :objects
@@ -18,4 +19,8 @@ class SiteSerializer < ApplicationSerializer
     Post.types
   end
 
+  def uncategorized_slug
+    Slug.for(SiteSetting.uncategorized_name)
+  end
+
 end