If nothing matches your search criteria, it's not going to display a message "no results found". It will merely display other stuff related to your search.
If you search 50 miles within a zip code:
- first it will show 50 miles radius (if anything is found at all! Keep in mind, this is a small site with only 80000 members worldwide, so there is a chance there is nobody in 50 miles radius).
- then it will show 100 miles
- then 500
- then 1000...
and so on, up to other countries.