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Fix race condition in multiplexer_objstorage add() return value

Nicolas Dandrimont requested to merge generated-differential-D3237-source into generated-differential-D3237-target

If an objstorage is read-only, the add() method will return None. The multiplexer should return one of the non-None values if it finds one, instead of the (inconsistent) first value returned by any of the threads.

Test Plan

tox is happy, even by making add() slow (e.g. by adding a sleep(1) to it)

Migrated from D3237 (view on Phabricator)

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