Check for systemd list-unit-files before restarting services

Co-authored-by: Karl M. Davis <karl@justdavis.com>

defaults/main.yml

@@ -60,4 +60,9 @@ certbot_keep_updated: true
 certbot_dir: /opt/certbot
 
 # Restart this service after successfull certificate creation:
-certbot_deployhook: "service {{ certbot_create_standalone_stop_services | join(' restart && service ') }} restart"
+certbot_deployhook: |
+  {% for service in certbot_create_standalone_stop_services %}
+  if systemctl list-unit-files | grep -q "^{{ service }}.service"; then
+    systemctl restart {{ service }}
+  fi
+  {% endfor %}