initialize empty array so it ends up as an empty array when num_users…

…=0 instead of undefined (#2552)

ansible/roles/ocp4-workload-quarkus-workshop/tasks/pre_workload.yml

@@ -10,9 +10,13 @@
   debug:
     msg: "Debugging num_users {{ num_users }}"
 
+- name: initialize username array
+  set_fact:
+    users: []
+
 - name: create usernames
   set_fact:
-    users: "{{ users | default([]) + ['user'+item | string] }}"
+    users: "{{ users + ['user'+item | string] }}"
   loop: "{{ range(1,((num_users | int) + 1)) | list }}"
 
 # Figure out paths