Description of problem:
FFU fails in the Ceph upgrade stage.
From the ceph-upgrade-run.log

2024-07-02 07:58:20,105 p=554280 u=root n=ansible | TASK [Update the placement of radosgw hosts] ***********************************
2024-07-02 07:58:20,105 p=554280 u=root n=ansible | Tuesday 02 July 2024  07:58:20 +0000 (0:00:00.231)       0:05:29.024 ********** 
2024-07-02 07:58:20,198 p=554280 u=root n=ansible | fatal: [controller-0 -> {{ groups[mon_group_name][0] }}]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: the inline if-expression on line 10 evaluated to false and no else section was defined.\n\nThe error appears to be in '/usr/share/ceph-ansible/infrastructure-playbooks/cephadm-adopt.yml': line 1016, column 7, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n    - name: Update the placement of radosgw hosts\n      ^ here\n"}
2024-07-02 07:58:20,289 p=554280 u=root n=ansible | fatal: [controller-1 -> {{ groups[mon_group_name][0] }}]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: the inline if-expression on line 10 evaluated to false and no else section was defined.\n\nThe error appears to be in '/usr/share/ceph-ansible/infrastructure-playbooks/cephadm-adopt.yml': line 1016, column 7, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n    - name: Update the placement of radosgw hosts\n      ^ here\n"}
2024-07-02 07:58:20,316 p=554280 u=root n=ansible | fatal: [controller-2 -> {{ groups[mon_group_name][0] }}]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: the inline if-expression on line 10 evaluated to false and no else section was defined.\n\nThe error appears to be in '/usr/share/ceph-ansible/infrastructure-playbooks/cephadm-adopt.yml': line 1016, column 7, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n    - name: Update the placement of radosgw hosts\n      ^ here\n"}
2024-07-02 07:58:20,316 p=554280 u=root n=ansible | NO MORE HOSTS LEFT 

Version-Release number of selected component (if applicable):
RHOS-16.2-RHEL-8-20240612.n.1
RHOS-17.1-RHEL-8-20240701.n.1

How reproducible:


Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:


Additional info: