Login fails

[bubak]

Hi all, I'm looking at the code and cannot see why it does not work. I want the browser to log in, so I copy get_browser() from the docs:

def get_browser(self, *a, **kw):
br = super().get_browser(*a, **kw)
if self.username is not None and self.password is not None:
br.open('https://ucet.idnes.cz/prihlasit')
...
return br

and get the error

...
File "calibre/web/feeds/news.py", line 754, in index_to_soup
AttributeError: 'NoneType' object has no attribute 'open'

so if I see it right, br is NoneType. Has anyone any idea why? Calibre version is 9.13.