from
Extracts a system error from the Throwable received on a client-side as a result of a failed gRPC call to server-side routines.
The Error is extracted from the trailer metadata of either StatusRuntimeException or StatusException only.
If any other type of Throwable is passed, Optional.empty() is returned.
Return
the extracted error or Optional.empty() if the extraction failed
Parameters
throwable
the Throwable to extract an Error