No need to check for both full and mountable.

All mountable engine are considered `full?` already.

Author: sikachu

railties/lib/rails/generators/rails/plugin_new/plugin_new_generator.rb

@@ -136,7 +136,7 @@ def javascripts
     end
 
     def images
-      if mountable? || full?
+      if mountable?
         empty_directory_with_gitkeep "app/assets/images"
       end
     end