I've successfully installed Django-SEO, but when I try to limit the number 
of backends (I only need/want my admin to have 'path' and not the other 
three) I am met with the following error:
AttributeError at /admin/'NoneType' object has no attribute '_meta'

I am using the documentation here: 
http://django-seo.readthedocs.org/en/latest/reference/definition.html#Meta.backends

*seo.py*
from rollyourown import seo

class AppMetadata(seo.Metadata):
    title = seo.Tag(head=True, max_length=68)
    description = seo.MetaTag(max_length=155)

    class Meta:
        backends = ('path',)
        #backends = ('path', 'modelinstance', 'model', 'view',) This works 
but includes all default backends

*admin.py*
from django.contrib import admin
from rollyourown.seo.admin import register_seo_admin

from localsite.seo import AppMetadata

register_seo_admin(admin.site, AppMetadata)

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