Merge "Prevent crash when there is no media source in the system" into rvc-qpr-dev am: c019f363ed

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Car/libs/+/13664426

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ib0f32f064f3af671b19ee4c5a3f57285285ef54f