Revert "DNS Locations: do not generate location records for unused locations"
This reverts commit bbf8227e3fd678d4bd6659a12055ba3dbe1c8230.
After deeper investigation, we found out that empty locations are needed
for clients, because clients may have cached records for longer time for
that particular location. Only way how to remove location is to remove
it using location-del
Reviewed-By: Petr Spacek <firstname.lastname@example.org>