Merge "Fix NPE in TTS service if no engine string" into udc-dev am: 987b2e7d...

Merge "Fix NPE in TTS service if no engine string" into udc-dev am: 987b2e7d am: 2b4d5f16 am: 6c8f4675 am: b997131b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24758914



Change-Id: Iaed456743297e0fe6a0088297a61a17bfbf1507e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>