You mean the space in the green text? That isn't a link. It is just text.
The gap is to force a line break on long URLs so that the result isn't forced down the page to appear under the last of the right-hand adverts.
Sometimes, very rarely, you will see a VERY big gap after the first or second result with the next result a very long way down the page, and placed directly after the adverts. That occurs on a very very long URL, because Google does not put in any other breaks on a very very long URL, they only have the one break.