#19987 Handle news and story objects with missing properties (source, topitem)

git-svn-id: https://svn.eionet.europa.eu/repositories/Naaya/trunk/eggs/Naaya@20915 a0171fae-0946-0410-966d-b1775066cd26
released 3.3.51, new version 3.3.52

git-svn-id: https://svn.eionet.europa.eu/repositories/Naaya/trunk/eggs/Naaya@20916 a0171fae-0946-0410-966d-b1775066cd26
Refs #3929 Forum; fix the media converter

git-svn-id: https://svn.eionet.europa.eu/repositories/Naaya/trunk/eggs/Naaya@20919 a0171fae-0946-0410-966d-b1775066cd26