DEV-696: fix regression from DEV-628

roles/connect_realm/defaults/main.yml

@@ -5,7 +5,7 @@ connect_realm_admin_password: "C0nnect-Realm-Admin!"
 
 client_web_origin_connect: "{{ http_s }}://{{ connect_base_url }}"
 client_web_origin_wordpress: "{{ http_s }}://{{ wordpress_base_url }}"
-client_web_origin_connect_external: "{{ http_s }}://{{ connect_external_subdomain }}.{{ domain }}"
+client_web_origin_connect_external: "{{ http_s }}://{{ connect_external_subdomain | default('unset') }}.{{ domain }}"
 
 current_realm_clients: [
   {