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

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I8805f00edfc3f01e39703063bb3ae66b26f686e7