Changes in Vista EPG cause vista_he script exception

A change in Microsoft EPG causes the vista_he script make an exception and terminate the MegaEPG without producing the guide. The script expected every show to have a category and today's EPG contains shows without category assigned. For the quickest workaround, please replace the vista_he.pyc file in the MegaEPG\Script directory with this corrected version (link removed since the corrected script is now a part of the release). Only the provided single file update is required. I will prepare a complete setup package for the version 1.0.2 with this fix included; the quick patch just lets you bring the MegaEPG back to work immediately.