outpost: add fallback for authentik_host when its not set in config

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

authentik/outposts/models.py

@@ -312,6 +312,10 @@ class Outpost(ManagedModel):
     @property
     def config(self) -> OutpostConfig:
         """Load config as OutpostConfig object"""
+        # When embedded outpost is generated initially, this field isn't set
+        # (on purpose, as we don't want it to be managed by us)
+        if "authentik_host" not in self._config:
+            self._config["authentik_host"] = ""
         return from_dict(OutpostConfig, self._config)
 
     @config.setter