Add cr remarks

lib/gitlab/auth/result.rb

@@ -3,6 +3,7 @@
 module Gitlab
   module Auth
     Result = Struct.new(:actor, :project, :type, :authentication_abilities) do
+      self::EMPTY = self.new(nil, nil, nil, nil).freeze
       def ci?(for_project)
         type == :ci &&
           project &&

lib/gitlab/middleware/go.rb

@@ -134,7 +134,7 @@ module Gitlab
       end
 
       def authentication_result(request, project)
-        empty_result = Gitlab::Auth::Result.new(nil, nil, nil, nil)
+        empty_result = Gitlab::Auth::Result::EMPTY
         return empty_result unless has_basic_credentials?(request)
 
         login, password = user_name_and_password(request)