check for empty group array in LDAP backend FS#1004

darcs-hash:20070621194636-7ad00-0a02dabd55d9bda3bf07b1eb8bcfdefd832c2df9.gz

inc/auth/ldap.class.php

@@ -192,7 +192,7 @@ class auth_ldap extends auth_basic {
                 if(is_array($key)) {
                     // use regexp to clean up user_result
                     list($key, $regexp) = each($key);
-                    foreach($user_result[$key] as $grp){
+                    if($user_result[$key]) foreach($user_result[$key] as $grp){
                         if (preg_match($regexp,$grp,$match)) {
                             if($localkey == 'grps') {
                                 $info[$localkey][] = $match[1];