try to fetch messages, yet can not fire the login event in ModelTable such that just get a NullPointerException in it.

git-svn-id: https://svn.apache.org/repos/asf/james/hupa/trunk@1522163 13f79535-47bb-0310-9956-ffa450edef68
Can fetch messages if click the Refresh button, but a strange issue occur.
- can not put the action.setFolder to the first place.

git-svn-id: https://svn.apache.org/repos/asf/james/hupa/trunk@1522164 13f79535-47bb-0310-9956-ffa450edef68