Validate ringtone URIs before setting am: 7ba175eaeb am: 236f1a0f17 am: 623d966fac am: a4a9b9f0e7 am: fa932686c5

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/24956689

Change-Id: Id029d4fd78881f7e32599f566e79b9640f3b13e5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>