XWIKI-10814: "create document" form: add links if the document already e...

...xist
Haaaaaaaaaaaaaaaa :-)
It's better when I read correctly!
I misunderstood  because "my english" of course and the second comment about '' for default wiki. I mixed both!
Thxs for you patience, I will fix it (and try to take account of Vincent comment about the old version compatibility)