* gnu/services/certbot.scm (certbot-nginx-server-configurations):
Don't return a broken nginx-server-configuration with empty server_name
when no certificate domains are configured. Instead add a separate
server for every certificate, so 0 certificates adds 0 servers.
Signed-off-by: Ludovic Courtès <ludo@gnu.org>
Reviewed-by: Bruno Victal <mirai@makinata.eu>