Do not display an exception in case we delete a non-existing namespace host #3116

Job	Run time
build	9m 23s
build-ceph	1m 44s
build-arm64	1h 1m 36s
discovery (container)	3m 57s
demo (unsecured)	4m 32s
discovery (embedded)	3m 47s
pytest (cli)	2m 33s
demo (psk)	5m 16s
ha (sanity)	3m 57s
pytest (cli_change_lb)	8m 1s
demo (dhchap)	5m 26s
ha (no_huge)	3m 46s
pytest (cli_change_keys)	3m 0s
atom	35m 35s
ha (ns_lb_change)	3m 48s
pytest (state)	2m 40s
ha (no_subsystems)	2m 41s
pytest (multi_gateway)	3m 1s
ha (auto_load_balance)	20m 12s
pytest (server)	3m 10s
ha (state_transitions)	4m 44s
pytest (grpc)	2m 55s
ha (state_transitions_both_gws)	6m 29s
pytest (omap_lock)	3m 30s
ha (state_transitions_loop)	20m 48s
pytest (log_files)	3m 28s
ha (state_transitions_rand_loop)	30m 47s
pytest (nsid)	3m 24s
ha (late_registration)	4m 15s
pytest (psk)	2m 23s
pytest (dhchap)	2m 25s
ha (late_registration_loop)	9m 8s
ha (4gws)	9m 5s
ha (4gws_loop)	11m 32s
ha (4gws_create_delete)	9m 2s
ha (4gws_create_delete_loop)	12m 2s
ha (namespaces)	12m 16s
ha (namespaces_loop)	21m 42s
ha (mtls)	3m 48s
ha (notify)	2m 1s
ha (ceph_status)	2m 31s
ha (blocklist)	2m 57s
ha (main_exit)	1m 39s
push-devel-image-to-ceph-registry	0s
push-images-to-ceph-registry	0s
	6h 10m 56s

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