Use .exists() to check for existing order number
Use .exists() to check for existing order number

The try/except clause to check if an order exists seems a bit weird and
non performant here. Just use .exists()

sonofatailor/django-oscar,sonofatailor/django-oscar,django-oscar/django-oscar,solarissmoke/django-oscar,sonofatailor/django-oscar,sonofatailor/django-oscar,django-oscar/django-oscar,django-oscar/django-oscar,solarissmoke/django-oscar,sasha0/django-oscar,django-oscar/django-oscar,sasha0/django-oscar,sasha0/django-oscar,solarissmoke/django-oscar,solarissmoke/django-oscar,sasha0/django-oscar