events: fix transport not allowing blank values

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

authentik/events/migrations/0001_squashed_0019_alter_notificationtransport_webhook_url.py

@@ -383,6 +383,7 @@ class Migration(migrations.Migration):
                     models.ManyToManyField(
                         help_text="Select which transports should be used to notify the user. If none are selected, the notification will only be shown in the authentik UI.",
                         to="authentik_events.NotificationTransport",
+                        blank=True,
                     ),
                 ),
             ],

authentik/events/models.py

@@ -481,6 +481,7 @@ class NotificationRule(PolicyBindingModel):
                 "selected, the notification will only be shown in the authentik UI."
             )
         ),
+        blank=True,
     )
     severity = models.TextField(
         choices=NotificationSeverity.choices,

schema.yml

@@ -22969,7 +22969,6 @@ components:
       - group_obj
       - name
       - pk
-      - transports
     NotificationRuleRequest:
       type: object
       description: NotificationRule Serializer
@@ -22998,7 +22997,6 @@ components:
             and shown to. If left empty, Notification won't ben sent.
       required:
       - name
-      - transports
     NotificationTransport:
       type: object
       description: NotificationTransport Serializer