fix nil game info in webhooks body

db/game.go

@@ -744,7 +744,7 @@ func GetGameInfoByGameItemID(id primitive.ObjectID) (*model.GameInfo, error) {
 		return nil, err
 	}
 	if len(res) == 0 {
-		return nil, nil
+		return nil, errors.New("game info not found")
 	}
 	return res[0], nil
 }