tangentlabs/django-oscar — pull request #912 by danyilmaz (2013-12-23 12:07:37+00:00)
Title: Turn Order.basket_id into a nullable ForeignKey field

Seems like a good idea. Mentioned here: https://groups.google.com/forum/#!msg/django-oscar/M0FgIB_f9tM/W-52L1zZMxAJ