I still don't think this makes a lot of sense to have group and report views in the same file. You did this mainly for technical reason (you want to share renderContactList) and I don't know/think that this is worth it.

I'd see a GroupView in a group_view.js file, and a InformationView in a information_view.js file. Maybe the "renderContactList" method could move somewhere else, like a RenderingUtils file?