Amend:
Use isEmpty() where possible in BandwidthManager.
Change-Id: I85fe54982245e088f60dd33148aed72e6abfc9ec
Former-commit-id: 54c3980cba [formerly 1161125c84 [formerly 28c97849800c624bdaa161f05777703ee2a510ac]]
Former-commit-id: 1161125c84
Former-commit-id: 73f884753a