When a project-wide default_auto_field is set, we get manage.py makemigrations attempting to generate a migration within Joyous.
This line, added in September yet unreleased, fixes the problem:
https://github.com/linuxsoftware/ls.joyous/blob/master/ls/joyous/apps.py#L7
Could we please get a release with this?
In the mean time, an app config override like this should be a suitable workaround: https://stackoverflow.com/a/67007098