modified: netbox_dns_bridge/catalog_zone_manager.py

modified:   netbox_dns_bridge/management/commands/dns-transfer-endpoint.py
modified:   netbox_dns_bridge/request_handler.py
modified:   netbox_dns_bridge/signals/netbox_dns_zones.py
Range of bug fixes and improvements

netbox_dns_bridge/request_handler.py

@@ -215,6 +215,10 @@ class DNSBaseRequestHandler(socketserver.BaseRequestHandler):
             else:
                 rrsets.append(rrset)
 
+        if soa_rrset is None:
+            LOGGER.error(f"Zone {dname} has no SOA — aborting")
+            return
+
         rrsets.insert(0, soa_rrset)  # Opening SOA
         rrsets.append(soa_rrset)  # Closing SOA