Both ways. It’s basically calling a search for the requested page and returning the results as a standard Ajaxsearch to the error page.
It's never just a game if you're winning.
http://www.travisdahlgren.com/abra => There were no search results.
http://www.travisdahlgren.com/77 => Please enter a search term...
But could be that this is just what the language file of AjaxSearch is giving even though it processed?
Ahh! I got it!! It’s the 3 minimum characters required! My bad it works brilliant!