Comment 16 for bug 1323975

$ git checkout master && git pull --ff-only && grep default=None nova -r
nova/network/model.py:73: def get_meta(self, key, default=None):
nova/scheduler/filters/utils.py:36:def validate_num_values(vals, default=None, cast_to=int, based_on=min):
nova/block_device.py:78: def __init__(self, bdm_dict=None, do_not_default=None):
nova/tests/fake_volume.py:73: def get(self, key, default=None):
nova/tests/fake_volume.py:107: def get(self, key, default=None):
nova/tests/virt/hyperv/db_fakes.py:107: def get(self, key, default=None):
nova/tests/keymgr/test_conf_key_mgr.py:54: CONF.set_default('fixed_key', default=None, group='keymgr')

https://review.openstack.org/#/q/project:%22openstack/nova%22+message:%22None%22+status:merged,p,002d690e000173e6 shows no commit about such issue, so I think it could be invalid, mark it as incomplete