Executor::invokeCatchingExns
Executor::invokeCatchingExns

Summary: Executors just carry on after a task they are running fails, although they try to log something marginally useful. Deduplicate the logic.

Reviewed By: aary, ot, philippv

Differential Revision: D26745058

fbshipit-source-id: 90fa558c89591b8a2d08e6820388970dee8811be

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