Fix avatar and header descriptions being returned for suspended accounts (#37641)

app/serializers/rest/account_serializer.rb

@@ -82,6 +82,10 @@ class REST::AccountSerializer < ActiveModel::Serializer
     full_asset_url(object.unavailable? ? object.avatar.default_url : object.avatar_static_url)
   end
 
+  def avatar_description
+    object.unavailable? ? '' : object.avatar_description
+  end
+
   def header
     full_asset_url(object.unavailable? ? object.header.default_url : object.header_original_url)
   end
@@ -90,6 +94,10 @@ class REST::AccountSerializer < ActiveModel::Serializer
     full_asset_url(object.unavailable? ? object.header.default_url : object.header_static_url)
   end
 
+  def header_description
+    object.unavailable? ? '' : object.header_description
+  end
+
   def created_at
     object.created_at.midnight.as_json
   end