def _sendFailureOrError(self, fail, requestID):
        if fail.check(Error) is None:
            self._sendFailure(fail, requestID)
        else:
            self._sendError(fail, requestID)
Call L{_sendError} or L{_sendFailure}, depending on whether C{fail}
dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/spread/pb.py/Broker._sendFailureOrError