better way of handling empty admin_site_name
better way of handling empty admin_site_name

vstoykov/django-wpadmin,nwaxiomatic/django-wpadmin,barszczmm/django-wpadmin,nwaxiomatic/django-wpadmin,vstoykov/django-wpadmin,vstoykov/django-wpadmin,barszczmm/django-wpadmin,nwaxiomatic/django-wpadmin,barszczmm/django-wpadmin,nwaxiomatic/django-wpadmin,barszczmm/django-wpadmin