The GitHub Actions job "Tests" on airflow.git has succeeded.
Run started by GitHub user uranusjr (triggered by uranusjr).

Head commit for run:
6cd20e6679dc36a86c1d672f05fd8f917e0dbb23 / Tzu-ping Chung <[email protected]>
Only default to None for a return value XComArg

Arbitrary XCom pushes *can* contain None, and when pulling them, the
only possible error report is an exception. This is fine since if you
are pulling one of these, you should be expected to handle the not-found
case.

For return values specifically, None is never pushed (by Airlow; and if
the user volunteeringly pushes an XCom as the return value, they should
be expected to follow the same rule), so returning None to signify "not
found" is OK. This is also necessary since resolving a return value XCom
is also done automatically by Airflow.

Report URL: https://github.com/apache/airflow/actions/runs/2866697795

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