gracefully handle missing groups in auth:ad

Ignore-this: 98bfcf5fc6f786038562b0abbccbc6a2

darcs-hash:20090902181259-7ad00-5411a421dc8bd0b1fe704df09631648d0009f9cb.gz

inc/auth/ad.class.php

@@ -150,7 +150,7 @@ class auth_ad extends auth_basic {
         }
 
         // always add the default group to the list of groups
-        if(!in_array($conf['defaultgroup'],$info['grps'])){
+        if(!is_array($info['grps']) || !in_array($conf['defaultgroup'],$info['grps'])){
             $info['grps'][] = $conf['defaultgroup'];
         }