Correct when statement.

tasks/main.yml

@@ -21,7 +21,7 @@
   when: tls_cert|default(True) and not common_role_finished is defined
 
 - include: add_tls_cert.yml
-  when: and not common_role_finished is defined
+  when: not common_role_finished is defined
 
 - include: ssh_ca.yml
   when: ssh_ca|default(True) and not common_role_finished is defined