No thumbnail in views if filepath is relative

Issue Summary

thumbnails are not generated in views if the filepath image does not begin with '/' :

Patch :
in render function in views_handler_field_teaserthumbnail.inc file, changing the line :
$thumbnail = theme('imagecache', $this->options['preset'], $thumbnail);
by
$thumbnail = theme('imagecache', $this->options['preset'], '/'.$thumbnail);