Recognize SOA as being seen for the first time

Eliminate one PHP error and emit special message when SOA is being seen
for the first time for a domain.
Eliminate some PHP errors we don't have to suffer
Avoid PHP err if SOA missing

dns_get_record() sometimes returns TRUE however doesn't have any SOA in
its array. Check for this and don't cause a PHP execution error. It's
supposed to return FALSE when there is no SOA, but it doesn't always.