Description
===========
Found in https://zuul.opendev.org/t/openstack/build/18265126f0404dd986909c5dab78468f
Deployment is failing because of the following ansible error.
https://fd1207866f13d5e5834a-35ecc7b59ac0acd5f8ed77dd8ebc5343.ssl.cf2.rackcdn.com/838959/6/gate/tripleo-ci-centos-9-scenario010-standalone/1826512/logs/undercloud/home/zuul/ansible.log
~~~
2022-06-29 02:50:13,843 p=33030 u=root n=ansible | 2022-06-29 02:50:13.843120 | fa163efa-a90c-7df8-cc31-000000000017 | TASK | Add hosts with mon label to ceph_mon inventory group for next play
2022-06-29 02:50:13,870 p=33030 u=root n=ansible | 2022-06-29 02:50:13.869151 | fa163efa-a90c-7df8-cc31-000000000017 | FATAL | Add hosts with mon label to ceph_mon inventory group for next play | undercloud | error={"msg": "Invalid data passed to 'loop', it requires a list, got this instead: [] + [ 'standalone.localdomain' ]. Hint: If you passed a list/dict of just one element, try adding wantlist=True to your lookup invocation or use q/query instead of lookup."}
2022-06-29 02:50:13,871 p=33030 u=root n=ansible | NO MORE HOSTS LEFT *************************************************************
2022-06-29 02:50:13,873 p=33030 u=root n=ansible | PLAY RECAP *********************************************************************
2022-06-29 02:50:13,874 p=33030 u=root n=ansible | undercloud : ok=2 changed=0 unreachable=0 failed=1 skipped=8 rescued=0 ignored=0
~~~
Fix proposed to branch: master
Review: https:/