Handle empty recommendations more gracefully

[benglass]

Right now if you enter a zip code that results in 0 matching orgs you just see the 3 headers on the results page and no message.

The logic is to only include results within 20 miles. Perhaps we should just sort by distance (we already do this) and then pluck off the first 3 if they are within 20 miles but never provide less than 1 result?

At the very least there shoudl be a message that says 'we couldnt find any within 20 miles'