类似这样的：

    152             ruthless = True
    153             while True:
--> 154                 self._html(True)
    155                 for i in self.tags(self.html, 'script', 'style'):
    156                     i.drop_tree()

https://github.com/buriy/python-readability/issues/41

是通过配置呢，还是自己打印Exception来实现呢？