Clean empty file directories for ProcessWire pages

Summary

Goes through all of your /site/assets/files/ directories and removes those that have no files in them.

Pages with file/image fields require a directory, so you should expect that some of the removed directories will be re-created by these pages.

How to install

Install the same way you would any other module

1. Copy PageCleanEmptyDirs.module to /site/modules/
2. Go to Admin > Modules > Check for new modules
3. Click install for this module, under the "Page" section and titled "Clean Empty Page File Dirs".
4. Click the checkbox in this module's config screen and submit.