Fix breakage from Ie33446a2

LQT was relying on the presence of a 'watchlist' key on the personal URLs array.
With Ie33446a2 this would no longer occur if the user had no 'viewmywatchlist' permission,
therefore the 'New messages' link would not appear at the top and a PHP Notice would be generated.

Change-Id: Icb81016da76911599c092a93cea3558d49d5293d