facts: fix osp/ceph external use case

d6da508a9b broke the osp/ceph external use case.

We must skip these tasks when no monitor is present in the inventory.

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1790508

Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>
(cherry picked from commit 2592a1e1e8)

roles/ceph-facts/tasks/facts.yml

@@ -38,12 +38,14 @@
     monitor_name: "{{ ansible_fqdn }}"
   when: mon_use_fqdn | bool
 
+- name: find a running monitor
+  when: groups.get(mon_group_name, []) | length > 0
+  block:
     - name: set_fact container_exec_cmd
       set_fact:
         container_exec_cmd: "{{ container_binary }} exec ceph-mon-{{ hostvars[groups[mon_group_name][0]]['ansible_hostname'] if not rolling_update else hostvars[mon_host | default(groups[mon_group_name][0])]['ansible_hostname'] }}"
       when:
         - containerized_deployment | bool
-    - groups.get(mon_group_name, []) | length > 0
 
     - name: find a running mon container
       command: "{{ container_binary }} ps -q --filter name=ceph-mon-{{ hostvars[item]['ansible_hostname'] }}"
@@ -52,7 +54,8 @@
       run_once: true
       delegate_to: "{{ item }}"
       with_items: "{{ groups.get(mon_group_name, []) }}"
-  when: containerized_deployment | bool
+      when:
+        - containerized_deployment | bool
 
     - name: check for a ceph mon socket
       shell: stat --printf=%n {{ rbd_client_admin_socket_path }}/{{ cluster }}-mon*.asok
@@ -63,7 +66,8 @@
       run_once: true
       delegate_to: "{{ item }}"
       with_items: "{{ groups.get(mon_group_name, []) }}"
-  when: not containerized_deployment | bool
+      when:
+        - not containerized_deployment | bool
 
     - name: check if the ceph mon socket is in-use
       command: grep -q {{ item.stdout }} /proc/net/unix
@@ -115,7 +119,6 @@
       delegate_to: "{{ groups[mon_group_name][0] if running_mon is undefined else running_mon }}"
       when:
         - not rolling_update | bool
-    - groups.get(mon_group_name, []) | length > 0
 
 # set this as a default when performing a rolling_update
 # so the rest of the tasks here will succeed