Actually fix NoMethodError around api_oply in railtie

Author: rwz

lib/jbuilder/railtie.rb

@@ -9,7 +9,7 @@ class Railtie < ::Rails::Railtie
         require 'jbuilder/dependency_tracker'
       end
 
-      if app.config.try(:api_only)
+      if app.config.respond_to?(:api_only) && app.config.api_only
         ActiveSupport.on_load :action_controller do
           include ActionView::Rendering
         end