returning a valid serial. [RT #32007]
Squashed commit of the following:
commit 0057f4b6e843c3998b987dbc7f32ceeee8afc150
Author: Mark Andrews <marka@isc.org>
Date: Fri Nov 30 08:13:15 2012 +1100
zone_get_from_db could return success without setting return valuses; serial is only valid if soacount is none zero
Conflicts:
lib/dns/zone.c