fixed nodes updating in the admin
fixed nodes updating in the admin

thanks Anonymous for the fix

(the admin needs tests, badly)

Ernsting/django-treebeard,velfimov/django-treebeard,Ernsting/django-treebeard,velfimov/django-treebeard,albedoweb/django-treebeard,Ernsting/django-treebeard,albedoweb/django-treebeard,kazmiruk/django-treebeard,torchbox/django-treebeard,torchbox/django-treebeard,velfimov/django-treebeard,kazmiruk/django-treebeard,torchbox/django-treebeard,albedoweb/django-treebeard,albedoweb/django-treebeard,kazmiruk/django-treebeard,velfimov/django-treebeard,kazmiruk/django-treebeard