Fix APCShadowFloorNode model when floor data is empty (thesadru#197)

genshin/models/starrail/chronicle/challenge.py

@@ -155,10 +155,16 @@ def __unnest_groups(cls, values: Dict[str, Any]) -> Dict[str, Any]:
 class APCShadowFloorNode(FloorNode):
     """Node for a apocalyptic shadow floor."""
 
+    challenge_time: Optional[PartialTime]
     buff: Optional[ChallengeBuff]
     score: int
     boss_defeated: bool
 
+    @property
+    def has_data(self) -> bool:
+        """Check if the node has data."""
+        return bool(self.avatars)
+
 
 class APCShadowFloor(StarRailChallengeFloor):
     """Floor in an apocalyptic shadow challenge."""