Add changed_when line for awk command to allow for idempotency when n…

…o results are found.

linux_os/guide/system/accounts/accounts-restrictions/password_storage/no_empty_passwords_etc_shadow/ansible/shared.yml

@@ -8,6 +8,7 @@
   command: >
     awk -F: '!$2 {print $1}' /etc/shadow
   register: users_nopasswd
+  changed_when: users_nopasswd.stdout_lines | length > 0
 
 - name: Lock users with no password
   command: >