stages/prompt: fallback to uuid for unique names

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

authentik/stages/prompt/migrations/0009_prompt_name.py

@@ -1,4 +1,5 @@
 # Generated by Django 4.1.5 on 2023-01-23 19:42
+from uuid import uuid4
 
 from django.apps.registry import Apps
 from django.db import migrations, models
@@ -14,6 +15,8 @@ def set_generated_name(apps: Apps, schema_editor: BaseDatabaseSchemaEditor):
         stage = prompt.promptstage_set.order_by("name").first()
         if stage:
             name += "_" + stage.name
+        else:
+            name += "_" + uuid4()
         prompt.name = name
         prompt.save()