Spurious edits adding blank lines to /config/edition

History of any significant changes to file is masked by the flood of insignificant ones

### Evidence / Screenshot (if possible)

### Relevant url?

https://openlibrary.org/config/edition?_compare=Compare&b=893&a=892&m=diff

### Steps to Reproduce

1. Go to https://openlibrary.org/config/edition
2. Click on History
3. Select any of the edits made by admin
4. Select the diff before and after that edit

* Actual: diff shows blank lines and only blank lines added
* Expected: no blank edits saved

### Details

- **Logged in (Y/N)?** y
- **Browser type/version?** any
- **Operating system?** any
- **Environment (prod/dev/local)?** prod

### Proposal & Constraints

### Related files

### Stakeholders

Related: #6353