Do not throw a useless "error communicationg with worker process" HumanReadableException
Do not throw a useless "error communicationg with worker process" HumanReadableException

Summary: Making this a human readabkle exception with overly generic message loses all the information we know about the exception.

Test Plan: tests

Reviewed By: coneko@fb.com

fbshipit-source-id: 76c4273

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