Added missing empty directories from svn import

Marius Cramer

2013-10-14 d9bcf68e395d6156645a7974b1a992aa6e6c00aa

 interface/lib/classes/custom_datasource.inc.php

@@ -105,6 +105,9 @@
         case 'default_dnsserver':
            $field = 'dns_server';
         break;
         case 'default_slave_dnsserver':
            $field = 'dns_server';
         break;
         case 'default_fileserver':
            $field = 'file_server';
         break;