Fix zone printing (#1578)

Dont return here, but continue

core/dnsserver/server.go

@@ -304,11 +304,11 @@ func (s *Server) OnStartupComplete() {
 		if err != nil {
 			// this should not happen, but we need to take care of it anyway
 			fmt.Println(zone + ":" + s.Addr)
-			return
+			continue
 		}
 		if ip == "" {
 			fmt.Println(zone + ":" + port)
-			return
+			continue
 		}
 		// if the server is listening on a specific address let's make it visible in the log,
 		// so one can differentiate between all active listeners