Tweak import script

server/core/management/commands/import_users.py

@@ -21,6 +21,9 @@ class Command(BaseCommand):
                 reader = csv.DictReader(f)
                 for row in reader:
                     email = row['Email'].lower().strip()
+                    if email == '':
+                        self.stdout.write('No e-mail set, skipping')
+                        continue
                     school_class_names = [c.strip() for c in row['Klassen'].split(',')]
                     first_name = row['Vorname'].strip()
                     last_name = row['Nachname'].strip()
@@ -30,6 +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.save()
 
                     if row['Rolle'] == 'Lehrer':