members/groups: create media dir if not exists

jdav_web/members/admin.py

@@ -46,7 +46,7 @@ from mailer.mailutils import send as send_mail, get_echo_link
 from django.conf import settings
 from utils import get_member, RestrictedFileField
 from schwifty import IBAN
-from .pdf import media_path
+from .pdf import media_path, media_dir
 
 #from easy_select2 import apply_select2
 
@@ -829,6 +829,9 @@ class GroupAdmin(CommonAdminMixin, admin.ModelAdmin):
                 _("You are not allowed to create a group overview."))
             return HttpResponseRedirect(reverse('admin:%s_%s_changelist' % (self.opts.app_label, self.opts.model_name)))
         
+        if not os.path.exists(media_dir()):
+            os.makedirs(media_dir())
+
         today = f"{datetime.today():%d.%m.%Y}"
         filename = f"gruppenuebersicht_jdav_{settings.SEKTION}_{today}.xlsx"
         workbook = xlsxwriter.Workbook(media_path(filename))