Merge pull request #1263 from jherdman/protect-against-pretend-generates

Protect against pretend generates

docs/modules/ROOT/pages/usage.adoc

@@ -41,7 +41,7 @@ your config/application.rb to apply RuboCop autocorrection to code generated by
 module YourCoolApp
   class Application < Rails::Application
     config.generators.after_generate do |files|
-      parsable_files = files.filter { |file| file.end_with?('.rb') }
+      parsable_files = files.filter { |file| File.exist?(file) && file.end_with?('.rb') }
       unless parsable_files.empty?
         system("bundle exec rubocop -A --fail-level=E #{parsable_files.shelljoin}", exception: true)
       end