outposts: fix error when getting state for non-existent outpost

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

authentik/lib/sentry.py

@@ -109,6 +109,7 @@ def before_send(event: dict, hint: dict) -> Optional[dict]:
             "django_redis",
             "django.security.DisallowedHost",
             "django_redis.cache",
+            "celery.backends.redis",
         ]:
             return None
     LOGGER.debug("sending event to sentry", exc=exc_value, source_logger=event.get("logger", None))

authentik/outposts/models.py

@@ -481,6 +481,8 @@ class OutpostState:
     def for_outpost(outpost: Outpost) -> list["OutpostState"]:
         """Get all states for an outpost"""
         keys = cache.keys(f"{outpost.state_cache_prefix}_*")
+        if not keys:
+            return []
         states = []
         for key in keys:
             instance_uid = key.replace(f"{outpost.state_cache_prefix}_", "")