hotfix patch 386 to comply with current practices

cosmogramme/sql/patch/patch_386.php

 <?php
-$sql = Zend_Registry::get('sql');
-$sql->query('alter table newsletters add column `mail_subject` varchar(255) default \'\'');
-$sql->query('update newsletters set mail_subject=titre');
+$adapter = Zend_Db_Table_Abstract::getDefaultAdapter();
+try {
+  $adapter->query('alter table newsletters add column `mail_subject` varchar(255) default \'\'');
+  $adapter->query('update newsletters set mail_subject=titre');
+} catch(Exception $e) {
+}