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: 928a73c8 am: 70a1b477

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



Change-Id: I293b5bfa6578b050f6cb4359f07e91172bdcbb12
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>