#20129 Hide LocalChannel objects if they expired and don't have 'topitem' set

git-svn-id: https://svn.eionet.europa.eu/repositories/Naaya/trunk/eggs@20949 a0171fae-0946-0410-966d-b1775066cd26
released 3.3.55, new version 3.3.56

git-svn-id: https://svn.eionet.europa.eu/repositories/Naaya/trunk/eggs@20950 a0171fae-0946-0410-966d-b1775066cd26