[automerge] [DO NOT MERGE] Fix Settings crash when setting a null ringtone 2p: 67b9fb57ea

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/18356595

Bug: 232502532
Bug: 221041256
Change-Id: Ibc32353ed93fd1f1f053066294b375c6cbd101ae
Merged-In: I044b680871472a3c272f6264c4ef272df542112e

src/com/android/settings/DefaultRingtonePreference.java

@@ -46,6 +46,11 @@ public class DefaultRingtonePreference extends RingtonePreference {
 
     @Override
     protected void onSaveRingtone(Uri ringtoneUri) {
+        if (ringtoneUri == null) {
+            setActualDefaultRingtoneUri(ringtoneUri);
+            return;
+        }
+
         String mimeType = getContext().getContentResolver().getType(ringtoneUri);
         if (mimeType == null) {
             Log.e(TAG, "onSaveRingtone for URI:" + ringtoneUri