revert to empty string and follow the api docs Bug: 155455467 Test: Manual Change-Id: Idd0955836bf7e8f2655bd4a3f216f66d4459bb4f
revert to empty string and follow the api docs Bug: 155455467 Test: Manual Change-Id: Idd0955836bf7e8f2655bd4a3f216f66d4459bb4f