When a user has not ever visited a wiki connected to SUL, attempting to `pywikibot login` will fail (P2372) as the account may not yet exist but will exist on login attempt.
```
tools.paws@jupyter-yuvipanda-test-account-44704412:~$ pwb.py login
Traceback (most recent call last):
File "/srv/pwb/pwb.py", line 248, in <module>
if not main():
File "/srv/pwb/pwb.py", line 242, in main
run_python_file(filename, [filename] + args, argvu, file_package)
File "/srv/pwb/pwb.py", line 120, in run_python_file
main_mod.__dict__)
File "/srv/pwb/scripts/login.py", line 193, in <module>
main()
File "/srv/pwb/scripts/login.py", line 176, in main
site.login(sysop)
File "/srv/pwb/pywikibot/site.py", line 2004, in login
if loginMan.login(retry=True):
File "/srv/pwb/pywikibot/login.py", line 265, in login
self.check_user_exists()
File "/srv/pwb/pywikibot/login.py", line 140, in check_user_exists
% (self.username, self.site))
pywikibot.exceptions.NoUsername: Username 'Yuvipanda-test-account' does not exist on wikipedia:test
<class 'pywikibot.exceptions.NoUsername'>
CRITICAL: Closing network session.
```