[debops.keyring] Fix usage in Ansible check mode

ansible/roles/debops.keyring/tasks/main.yml

@@ -93,6 +93,7 @@
 - name: Gather information about existing UNIX accounts
   getent:
     database: 'passwd'
+  check_mode: False
 
   # In some cases 'apt-key' command refuses to work complaining that it has to
   # be run by root. This task should handle these cases gracefully.
@@ -128,7 +129,7 @@
   become_user: '{{ item.user | d(keyring__dependent_gpg_user if keyring__dependent_gpg_user|d() else "root") }}'
   loop: '{{ q("flattened", (keyring__dependent_gpg_keys)) }}'
   register: keyring__register_gpg_key
-  until: keyring__register_gpg_key.rc == 0
+  until: keyring__register_gpg_key.rc|d(0) == 0
   when: (keyring__enabled|bool and (item.id|d() or item is string) and
          (item.user | d(keyring__dependent_gpg_user if keyring__dependent_gpg_user|d() else "root")) in getent_passwd.keys())
   changed_when: '("Adding key..." in keyring__register_gpg_key.stdout_lines) or