'$result' instead of the change details in email notification

subject: XWiki updates, 4 documents have been modified since 2011/06/27 13:00
body:

Hello Administrator,
This message is sent by XWiki. Here are the documents in your watchlist that have been modified since the last notification: 

- xwiki
-- Space1
--- PageName1
 Page1NameFull
 On 2011/06/27 13:07, the document has been modified by D
 ... change description ...

-- Space2
--- PageName2
 Page2NameFull
 On 2011/06/27 13:59, the document has been modified by D
 $result 

-- Space3
--- PageName3
 Page3NameFull
 On 2011/06/27 13:51, the document has been modified by D
 ... change description ...
etc