fix(sqlalchemy): safely handle garbage-collected target during event listener removal - #4872
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Fixes #4817
Description
During test teardown or
uninstrument(), event listener cleanup inEngineTracer.remove_all_event_listenerscan fail if the weakref target resolves toNoneor raisesInvalidRequestErrorwhen SQLAlchemy tries to unregister the event.Changes
Nonebefore removal.InvalidRequestErrorduringevent.remove()to prevent flaky teardown crashes.