: Perform manual BlogPageAdmin registration, as django-polymorphic 1.4+ requires.
: Perform manual BlogPageAdmin registration, as django-polymorphic 1.4+ requires.

This new registration system worked as of django-polymorphic 1.0,
and this deprecated feature was recently removed because it caused
subtle bugs.

edoburu/django-fluent-blogs,edoburu/django-fluent-blogs