Project Edit Is Broken If Project Lead Is A Renamed User

Steps to Reproduce

1. Create a project with any user as the Lead
2. Rename the username for the project Lead
3. Go to project administration and click Edit Project
4. Add some descirption for project
5. Click Update

Expected Results

Project is updated

Actual Results

1. Nothing happens, no error messages as well.
2. Nothing in logs

Workaround

1. Change the Project Lead to an user who has not been renamed
2. Make the Project Edits
3. Revert Project Lead back to original user

Note: it's not possible to determine if an user had been renamed in JIRA's interface, but you can check via the database table app_user. If the user_key does not match lower_user_name, then the username had been changed.