If I click on a Closed Shared Invitation, that isn't obvious to me

(Bug, Closed -> Fixed, Priority: Critical, Test Status: No automated tests yet , Reported By Justin du Coeur, )
Invites
Summary: I still get the "You are logged in as Guest" message, with no indication that this isn't a valid invitation!
There is no mystery here: LoginController isn't communicating the failure back to the client.