RJS doesn't render with an HTML layout by default

actionpack/lib/action_controller/base/compatibility.rb

@@ -124,6 +124,7 @@ module ActionController
       super
     rescue ActionView::MissingTemplate
       _find_by_parts(_layout({}), {})
+      nil
     end
 
     def performed?

actionpack/test/controller/mime_responds_test.rb

@@ -375,12 +375,10 @@ class MimeControllerTest < ActionController::TestCase
   end
 
   def test_rjs_type_skips_layout
-    pending(:new_base) do
     @request.accept = "text/javascript"
     get :all_types_with_layout
     assert_equal 'RJS for all_types_with_layout', @response.body
   end
-  end
 
   def test_html_type_with_layout
     @request.accept = "text/html"