Add random password to imported users

server/core/management/commands/import_users.py

@@ -33,7 +33,7 @@ class Command(BaseCommand):
                     user, created = User.objects.get_or_create(email=email, username=email)
                     user.first_name = first_name
                     user.last_name = last_name
-                    user.set_unusable_password()
+                    user.set_password(User.objects.make_random_password())
                     user.save()
 
                     if row['Rolle'] == 'Lehrer':