Fix set_fact on the CephMgrAnsibleVars

The purpose of this patch is react on the issue generated by [1],
where an empty dict sect_fact is not allowed for ansible >= 2.11.
For this reason, we're going to always set those variables and
defer to the ansible layer the evaluation of the DashboardEnabled
condition.

[1] https://github.com/ansible/ansible/pull/73684

Closes-Bug: #1949033
Change-Id: I4ab2d20df22bdc9b140019f90d1370ef17f09294

deployment/cephadm/ceph-mgr.yaml

@@ -114,24 +114,22 @@ outputs:
       external_deploy_tasks:
         list_concat:
         - {get_attr: [CephBase, role_data, external_deploy_tasks]}
-        - - name: ceph_mgr_external_deploy_init
-            when: step|int == 1
-            tags:
-              - ceph
-            block:
-              - name: set tripleo-ansible ceph dashboard vars
-                set_fact:
-                  ceph_dashboard_vars:
-                    if:
-                      - {get_param: CephEnableDashboard}
-                      - if:
-                        - internal_tls_enabled
-                        - map_merge:
-                            - {get_attr: [CephMgrAnsibleVars, value, vars]}
-                            - tripleo_cephadm_dashboard_crt: /etc/pki/tls/certs/ceph_dashboard.crt
-                            - tripleo_cephadm_dashboard_key: /etc/pki/tls/private/ceph_dashboard.key
-                            - tripleo_cephadm_dashboard_grafana_api_no_ssl_verify: true
-                        - {get_attr: [CephMgrAnsibleVars, value, vars]}
+        - if:
+          - {get_param: CephEnableDashboard}
+          - - name: set tripleo-ansible ceph dashboard vars
+              when: step|int == 1
+              tags:
+                - ceph
+              set_fact:
+                ceph_dashboard_vars:
+                  if:
+                  - internal_tls_enabled
+                  - map_merge:
+                      - {get_attr: [CephMgrAnsibleVars, value, vars]}
+                      - tripleo_cephadm_dashboard_crt: /etc/pki/tls/certs/ceph_dashboard.crt
+                      - tripleo_cephadm_dashboard_key: /etc/pki/tls/private/ceph_dashboard.key
+                      - tripleo_cephadm_dashboard_grafana_api_no_ssl_verify: true
+                  - {get_attr: [CephMgrAnsibleVars, value, vars]}
       metadata_settings:
         if:
         - internal_tls_enabled