E.g. after a database import the SCM repository passwords can no longer
be decrypted. This would lead to an exception when trying to decode the
password to UTF-8. Instead, `Repository._get_password()` will now return
`None` resulting in requiring the user to reset the password.

Added SVN repository with authentication.
Dumped database using: mysqldump --all-databases
Imported the dump into a fresh MySQL instance.
Successfully navigated to: /admin/db/scmtools/repository/1/
Observed error message in log.