Comment 6 for bug 1973631

Reviewed: https://review.opendev.org/c/openstack/glance/+/848994
Committed: https://opendev.org/openstack/glance/commit/fc9a53d257babf0ef7f0bec12ffff46fc570910b
Submitter: "Zuul (22348)"
Branch: stable/xena

commit fc9a53d257babf0ef7f0bec12ffff46fc570910b
Author: Dan Smith <email address hidden>
Date: Mon May 16 11:58:05 2022 -0700

    Fix failing namespace list delete race

    If a namespace is deleted by another client while we are doing a
    namespace list operation, we will fail the list with NotFound if we
    try to pull the resource_type_associations list. The latter re-queries
    the DB for the namespace and will raise NotFound to us. This is
    especially bad because the namespace being deleted need not even
    belong to the caller of the list, as is the case in a tempest run.

    This makes us catch the failure and continue the operation, reporting
    no associations so that the client gets a consistent view and no
    error.

    Closes-Bug: #1973631
    Change-Id: I09fc9164a08f42507d2aec44c5b382a72f232571
    (cherry picked from commit 35e6c57bc90365796f45ada9271e532068557b8a)
    (cherry picked from commit cc98dbef31be30372b59b2d18b78694ce0879aa0)