Merge "Don't crash if the MediaCodecList is null." am: f80c56df73 am: ac569866d9 am: e0c584e656

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1556749

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I6ef505c00d87f48c5af36d37a9570906d559889b