fix: don't doubly-export title or slug if they appear as placeholders
fix: don't doubly-export title or slug if they appear as placeholders

pombredanne/django-page-cms-1,remik/django-page-cms,remik/django-page-cms,batiste/django-page-cms,akaihola/django-page-cms,pombredanne/django-page-cms-1,batiste/django-page-cms,remik/django-page-cms,pombredanne/django-page-cms-1,remik/django-page-cms,batiste/django-page-cms,akaihola/django-page-cms,akaihola/django-page-cms