[automerger skipped] Add placeholder when media control title is blank am: df4686dc -s ours am: 43a6d0e2 -s ours am: 9c47a9ad -s ours am: abd594af -s ours am: 54e3d50f -s ours am: ca127797 -s ours

am skip reason: Merged-In Ie406c180af48653595e8e222a15b4dda27de2e0e with SHA-1 a0fda1f3 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23497629



Change-Id: Iefe93b1ddc9eaf83317f40255005f0638b9d1016
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>