return empty metadata whenever anyone asks.
return empty metadata whenever anyone asks.

Change-Id: Ib5cfe9c21ed47400bc6c50f01262102db2f0bf47

google/android-cuttlefish,google/android-cuttlefish,google/android-cuttlefish,google/android-cuttlefish,google/android-cuttlefish,google/android-cuttlefish,google/android-cuttlefish