create users - fix omit on user groups and append

tasks/user.yml

@@ -15,7 +15,7 @@
     name: '{{ item.name }}'
     group: '{{ item.group | default(item.name) }}'
     groups: "{{ item.groups | default([]) | join(',') or omit }}"
-    append: '{{ item.append|default("yes")}}'
+    append: "{{ item.append | default('yes') if (item.groups is defined and item.groups) else omit }}"
     shell: '{{ item.shell | default("/bin/bash") }}'
     uid: '{{ item.uid | default(omit) }}'
     non_unique: '{{ item.non_unique | default(omit) }}'
@@ -35,7 +35,7 @@
     expires: '{{ item.expires | default(omit) }}'
     move_home: '{{ item.move_home | default(omit) }}'
     remove: '{{ item.remove | default(omit) }}'
-  with_items : "{{users_system.user|default([])}}"
+  loop: "{{ users_system.user | default([]) }}"
   no_log: "{{ no_log | default(true) }}"
   when: ((item.name is defined and item.name != 'root') and (item.state is undefined or (item.state is defined and item.state != 'absent')))