[Pkg-mailman-hackers] Bug#942540: removing some files should help

[Bjoern Franke]

see 
https://lists.mailman3.org/archives/list/mailman-users@mailman3.org/thread/PAMC4L5LALDRWXTUNJMQCL4AQRJEMEVF/

But afterwards, it crashes with another issue:

Traceback (most recent call last):
   File "/usr/bin/django-admin", line 21, in <module>
     management.execute_from_command_line()
   File 
"/usr/lib/python3/dist-packages/django/core/management/__init__.py", 
line 364, in execute_from_command_line
     utility.execute()
   File 
"/usr/lib/python3/dist-packages/django/core/management/__init__.py", 
line 308, in execute
     settings.INSTALLED_APPS
   File "/usr/lib/python3/dist-packages/django/conf/__init__.py", line 
56, in __getattr__
     self._setup(name)
   File "/usr/lib/python3/dist-packages/django/conf/__init__.py", line 
41, in _setup
     self._wrapped = Settings(settings_module)
   File "/usr/lib/python3/dist-packages/django/conf/__init__.py", line 
110, in __init__
     mod = importlib.import_module(self.SETTINGS_MODULE)
   File "/usr/lib/python3.7/importlib/__init__.py", line 127, in 
import_module
     return _bootstrap._gcd_import(name[level:], package, level)
   File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
   File "<frozen importlib._bootstrap>", line 983, in _find_and_load
   File "<frozen importlib._bootstrap>", line 965, in 
_find_and_load_unlocked
ModuleNotFoundError: No module named 'settings'