kaxil commented on a change in pull request #20470:
URL: https://github.com/apache/airflow/pull/20470#discussion_r774543326
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File path: airflow/models/taskinstance.py
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@@ -1764,7 +1764,7 @@ def handle_failure(
@provide_session
def handle_failure_with_callback(
self,
- error: Union[str, Exception],
+ error: Optional[Union[str, Exception]] = None,
Review comment:
Why this change?
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