Index: trunk/packages/sipb-xen-dns/code/dnsserver.py
===================================================================
--- trunk/packages/sipb-xen-dns/code/dnsserver.py	(revision 649)
+++ trunk/packages/sipb-xen-dns/code/dnsserver.py	(revision 650)
@@ -88,4 +88,7 @@
                 results.append(dns.RRHeader(domain, dns.SOA, dns.IN,
                                             ttl, self.soa, auth=True))
+            if len(results) == 0:
+                authority = []
+                additional = []
             return defer.succeed((results, authority, additional))
         else: