Merge pull request #4410 from rhcarvalho/fix-4306-gluster-vars

Fix possible access to undefined variable

playbooks/common/openshift-cluster/evaluate_groups.yml

@@ -155,5 +155,5 @@
       groups: oo_glusterfs_to_config
       ansible_ssh_user: "{{ g_ssh_user | default(omit) }}"
       ansible_become: "{{ g_sudo | default(omit) }}"
-    with_items: "{{ g_glusterfs_hosts | union(g_glusterfs_registry_hosts) | default([]) }}"
+    with_items: "{{ g_glusterfs_hosts | union(g_glusterfs_registry_hosts | default([])) }}"
     changed_when: no