Comment 1 for bug 1765568

I know what the problem probably is, copied from bug 1767139 which was reported against the same change but in pike 16.1.1:

(9:59:34 AM) mriedem: set_inventory_for_provider -> _ensure_resource_provider -> _create_resource_provider -> safe_connect returns None because it can't talk to placement yet
(9:59:41 AM) mriedem: https://review.openstack.org/#/c/524618/2/nova/scheduler/client/report.py@516
(9:59:44 AM) mriedem: so we put None in the cache