New Feature "Show group members" does not work with https

Check:
![screen shot 2014-08-13 at 10 08 48](https://cloud.githubusercontent.com/assets/437933/3902621/288800a8-22c1-11e4-9539-f3d189e10ede.png)

Plone wraps the link with a <span>. 

Since you are doing the `parent` method, with https it returns the wrapping span instead of the `td`.
This could be fixed by using. `self.closest('td').find.....`