sometimes TVA files are corrupt / incomplete, e.g.
[2014-08-11_06:02:23] MEDIALINK: Fetched TVA-File http://api.linkedtv.eu/data/RBB/tva/rbbaktuell_20140809.html corrupt or incomplete!
[2014-08-11_06:02:24] FETCH: TVA-Source-URL was: http://www.rbb-online.de/content/rbb/exporter/ard/tva.xml/content/rbb/rbb/rbbaktuell/archiv/20140809_2145