ansible mediaserver: only use realip when variable is defined, refs #33676

ansible/roles/mediaserver/tasks/main.yml

@@ -179,6 +179,7 @@
   notify: restart nginx
   when:
     - groups['mediaserver'] | length > 1
+    - real_ip_from
   template:
     src: realip.conf.j2
     dest: /etc/nginx/conf.d/realip.conf