From 47e82e09b10fd50b718fd71c54bd2d6a13dc376b Mon Sep 17 00:00:00 2001
From: Benjamin Fleischer <github@benjaminfleischer.com>
Date: Sun, 12 Mar 2017 20:18:48 -0500
Subject: [PATCH] Make behavior explicit

---
 lib/active_model/serializer.rb | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/active_model/serializer.rb b/lib/active_model/serializer.rb
index 54a3724d..9d779008 100644
--- a/lib/active_model/serializer.rb
+++ b/lib/active_model/serializer.rb
@@ -92,6 +92,8 @@ module ActiveModel
           serializer_class
         elsif klass.superclass
           get_serializer_for(klass.superclass)
+        else
+          nil # No serializer found
         end
       end
     end