@property
  def _get_html_page(self):
    raise NotImplementedError
L{NewsBuilder.main} raises L{SystemExit} when other than 1 argument is
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/datastore_admin/backup_handler.py/BaseDoHandler._get_html_page--crossover with--dataset/ETHPy150Open twisted/twisted/twisted/python/test/test_release.py/ScriptTests.test_badNumberOfArgumentsToBuildNews