display timestamp and version information on page with no results

" Information for relays was published: 2018-08-14 11:00:00 UTC. Information for bridges was published: 2018-08-14 10:42:38 UTC.

Onionoo version: 6.2/7d73a0c "

this information is not displayed on the page if no result is found, but especially in that cases it would be important to know

https://metrics.torproject.org/rs.html#search/NOTEXISTING