return empty shared_train_participants list if not shared_train

Author: jrutschke

docs/getting-started/changelog.rst

@@ -37,6 +37,7 @@ Changelog
         - Fix some typing issues with adapters in :class:`~twitchio.Client`.
         - Fixed a bug causing conduit websockets to be treated as eventsub websockets and fail after a reconnect attempt.
         - Fixed incorrect documentation in :func:`~twitchio.PartialUser.fetch_moderators`.
+        - Fix :class:`~models.eventsub_.BaseHypeTrain` now returns empty list for shared_train_participants if not shared_train.
 
 
 3.1.0

twitchio/models/eventsub_.py

@@ -4957,11 +4957,15 @@ def __init__(self, payload: BaseHypeTrainEvent, *, http: HTTPClient) -> None:
             HypeTrainContribution(c, http=http) for c in payload["top_contributions"]
         ]
         self.started_at: datetime.datetime = parse_timestamp(payload["started_at"])
-        self.shared_train_participants: list[PartialUser] = [
-            PartialUser(u["broadcaster_user_id"], u["broadcaster_user_login"], u["broadcaster_user_name"], http=http)
-            for u in payload["shared_train_participants"]
-        ]
         self.shared_train: bool = bool(payload["is_shared_train"])
+        self.shared_train_participants: list[PartialUser] = (
+            [
+                PartialUser(u["broadcaster_user_id"], u["broadcaster_user_login"], u["broadcaster_user_name"], http=http)
+                for u in payload["shared_train_participants"]
+            ]
+            if self.shared_train
+            else []
+        )
         self.type: Literal["treasure", "golden_kappa", "regular"] = payload["type"]
 
     def __repr__(self) -> str: