Previous implementation assumed 'a' and 'b' to be undefined, but not empty array. Change-Id: I7a339d839b0645612f666de973f5563f0c0d6af0
Previous implementation assumed 'a' and 'b' to be undefined, but not empty array. Change-Id: I7a339d839b0645612f666de973f5563f0c0d6af0