code format

src/pretix/control/forms/event.py

@@ -1,5 +1,3 @@
-from urllib.parse import urlencode, urlparse
-
 from django import forms
 from django.conf import settings
 from django.core.exceptions import ValidationError
@@ -17,6 +15,7 @@ from i18nfield.forms import (
     I18nForm, I18nFormField, I18nFormSetMixin, I18nTextarea, I18nTextInput,
 )
 from pytz import common_timezones, timezone
+from urllib.parse import urlencode, urlparse
 
 from pretix.base.channels import get_all_sales_channels
 from pretix.base.email import get_available_placeholders
@@ -754,6 +753,7 @@ def contains_web_channel_validate(val):
     if "web" not in val:
         raise ValidationError(_("The web channel must be selected to receive these emails."))
 
+
 class MailSettingsForm(SettingsForm):
     auto_fields = [
         'mail_prefix',