Fix Settings crash when setting a null ringtone am: ec3ae8bb am: 39759724...

Fix Settings crash when setting a null ringtone am: ec3ae8bb am: 39759724 am: 0e2485a7 am: 1a55855a

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/18400413



Change-Id: Id2cb8a397c471d070dc8351dfe8b75d808b6c10f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>