Favourites are wrongly listed when pages have rights limitations

Step to reproduce:

• Install favorite v1.4.2
• Create as admin a page and set view right to admin group
• Add this page to the favorite of the admin user
• Create a second user
• Login as the second user
• See the favorite of the admin

Expected:

We have a nice list of the favorite of the admin

Currently:

$services.rendering.escape($services.rendering.escape($fDoc.plainTitle, 'xwiki/2.1'), 'xwiki/2.1') is listed because the user can't see the favorite and so velocity crash.