Can't delete message parts once they are saved

On admin/settings/messaging/edit/notifications-event, you can't delete a non-default message part (e.g., Subject) once it is defined. If you click Save, it doesn't.

Patch:

diff -u -r1.1 -r1.2
--- messaging.module    7 May 2008 07:15:28 -0000       1.1
+++ messaging.module    7 May 2008 07:19:32 -0000       1.2
@@ -1,5 +1,5 @@
 <?php
-// $Id: messaging.module,v 1.1 2008/05/07 07:15:28 cvsroot Exp $
+// $Id: messaging.module,v 1.2 2008/05/07 07:19:32 cvsroot Exp $
 /**
  * Drupal Messaging Framework
  *
@@ -248,9 +248,9 @@
   $group = $form_values['group'];
   foreach ($form_values['messages'] as $key => $messages) {
     foreach ($messages as $method => $text) {
+      // Save
+      db_query("DELETE FROM {messaging_message_parts} WHERE type = '%s' AND msgkey = '%s' AND method = '%s'", $group, $key, $method);
       if ($text = trim($text)) {
-        // Save
-        db_query("DELETE FROM {messaging_message_parts} WHERE type = '%s' AND msgkey = '%s' AND method = '%s'", $group, $key, $method);
         db_query("INSERT INTO {messaging_message_parts} (type, msgkey, method, module, message) VALUES('%s', '%s', '%s', '', '%s')", $group, $key, $method, $text);
       }
     }