Missing newline causes syntax errors in vhost.d nginx config

When redirection is enabled on a site, the generated nginx vhost config has syntax errors preventing nginx from restarting.

Testing nginx configuration: nginx: [emerg] "listen" directive is not allowed here in /var/aegir/config/server_master/nginx/vhost.d/sitename.com:57
nginx: configuration file /etc/nginx/nginx.conf test failed

The failing lines of config:

# alias redirection virtual hostserver {
  limit_conn   gulag 32;
  listen       *:80;
  server_name  somealias.something.com;
  access_log   off;
  rewrite ^ $scheme://www.sitename.com$request_uri? permanent;
}