Support objects without `get_absolute_url()` in FluentCommentsAdmin
Support objects without `get_absolute_url()` in FluentCommentsAdmin

Fixes: #34

django-fluent/django-fluent-comments,django-fluent/django-fluent-comments,django-fluent/django-fluent-comments,django-fluent/django-fluent-comments,edoburu/django-fluent-comments,edoburu/django-fluent-comments,edoburu/django-fluent-comments