SV: wicket 1.4 : Link with no model

[Wilhelmsen Tor Iver]

> or a shorter
> 
> Link<?> foo = new Link<Void>

... or wait for JDK 1.7 where you can do

Link<Void> foo = new Link<>

Which is more useful in cases like

Map<String, List<Foo>> fie = new HashMap<>();

- Tor Iver