Fix: added text back to empty link. Text was accidentally removed with c...

...ommit 86097718bfb483bca1e0b8c4e9de4a6426c0ce10

Also see forum topic: http://www.webtrees.net/index.php/en/forum/help-for-ver-1-5-1/28462-pedigree-map-no-link-to-individuals-informations#43078

Maybe this fix should be made on the 1.4 branch as well.