added check for invalid responses from gethostbynamel

fixed indent

scripts/jobs/cron_tasks.inc.dns.10.bind.php

@@ -36,6 +36,8 @@ class bind {
 				// DNS servers might be multi homed; allow transfer from all ip
 				// addresses of the DNS server
 				$nameserver_ips = gethostbynamel(trim($nameserver));
+				// ignore invalid responses
+				if (is_array($nameserver_ips)) {
 					if (substr($nameserver, -1, 1) != '.') {
 						$nameserver.= '.';
 					}
@@ -45,6 +47,7 @@ class bind {
 					);
 				}
 			}
+		}
 
 		if (Settings::Get('system.mxservers') != '') {
 			$mxservers = explode(',', Settings::Get('system.mxservers'));