Fix condition for compatibility with Ansible 2.19

Author: tobiashuste

roles/ssh_keys/tasks/main.yml

@@ -9,7 +9,7 @@
     name: "{{ ssh_user.name }}"
     state: "present"
   when:
-    - "ssh_user.name | default('')"
+    - "ssh_user.name is defined"
     - "ssh_user.name | length > 0"
     - "ssh_user.create_user_account | default(false) | bool"
   loop: "{{ ssh_user_list }}"
@@ -22,7 +22,7 @@
     key: "{{ ssh_user.authorized_keys | default([]) | join('\n') }}"
     exclusive: "{{ ssh_authorized_keys_exclusive }}"
   when:
-    - "ssh_user.name | default('')"
+    - "ssh_user.name is defined"
     - "ssh_user.name | length > 0"
   loop: "{{ ssh_user_list }}"
   loop_control: