Request for help from plugin author

Hi everybody, due to my having less time than desired for this plugin, I would much appreciate some help to review a pull request that was kindly submitted by ianmjones. If you have the time and are an experienced PHP/WP developer, please take a look at https://github.com/mansj/enable-media-replace/pull/24 and leave a comment for me here or on GitHub to let me know whether I should merge it or not. Thanks in advance!