Enable "Next unread" button in forum without an active post.

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@7631 b45a01b8-16f6-495d-af2f-9b41ad6348cc
fixed display of unknown hash in turtle router dialog

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@7632 b45a01b8-16f6-495d-af2f-9b41ad6348cc