Comment 14 for bug 1948507

Reviewed: https://review.opendev.org/c/openstack/cinder/+/815560
Committed: https://opendev.org/openstack/cinder/commit/d83a2289d582ad137017f9589c2e42e8d1543c13
Submitter: "Zuul (22348)"
Branch: master

commit d83a2289d582ad137017f9589c2e42e8d1543c13
Author: Luciano Lo Giudice <email address hidden>
Date: Tue Oct 26 19:08:07 2021 -0300

    Fix QOS computation

    It's possible for a volume's node name to be `None` (because an
    API is not present, or the user doesn't have privileges, for example).
    For these cases, computing the QOS name can lead to a TypeError, since
    it needs to concatenate a prefix to the node name. This patchset fixes
    this problem by returning an empty string for the QOS if the node name
    is indeed None.

    Closes-Bug: #1948507
    Change-Id: I16d7bf9fb023f3bc7be0fc8e3e08421b2754d5a5