'Returns the path where the episode thumbnail should be stored. Defaults to
the same path as the episode file but with a .tbn extension.
ep_obj: a TVEpisode instance for which to create the thumbnail'

@staticmethod
def get_episode_thumb_path(ep_obj):

    if os.path.isfile(ep_obj.location):
        tbn_filename = replaceExtension(ep_obj.location, u'tbn')
    else:
        return None
    return tbn_filename
