Catch all throwables in FlipperResponder destructor
Catch all throwables in FlipperResponder destructor

Summary: Exceptions should never be thrown from destructors, because if an exception is already propogating at the time the destructor is called. Program will terminate.

Reviewed By: passy

Differential Revision: D14123526

fbshipit-source-id: 15ff74f4f14eb28a586055e1b1a5d54231b549da

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