Merge "[Bugfix]audio:fix NPE when buildBluetoothRoutes" am: b801d3549f am: 62621db913 am: 0db017d837

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1519791

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I7c8eac7b3ad067e5fabd44a0ea26feddbecaee85