Patch provided by German Rumm <german.rumm@gmail.com> to avoid a fatal error in assertLink (when the link with a label does not exists in a page)
Patch provided by German Rumm <german.rumm@gmail.com> to avoid a fatal error in assertLink
(when the link with a label does not exists in a page)

git-svn-id: 37a4f2ad551c3de6a1a8dac75489339ab89cc9f5@1612 9ad96551-d73f-0410-9433-afe301b4b3ac

GerHobbelt/simpletest,GerHobbelt/simpletest,GerHobbelt/simpletest