Fix NPE crash in TextToSpeechSettings

Recyclerview's getItemAnimator() is nullable so we need a null check.

Bug: 245383855
Test: Manual

Change-Id: Iebad430e81a32b7fa8ebe0543abf3f122befb7e5

src/com/android/settings/tts/TextToSpeechSettings.java

@@ -228,7 +228,9 @@ public class TextToSpeechSettings extends SettingsPreferenceFragment
         // them to resize, which results in the recyclerview smoothly animating them at inopportune
         // times. Disable the animation so widgets snap to their positions rather than sliding
         // around while the user is interacting with it.
-        getListView().getItemAnimator().setMoveDuration(0);
+        if (getListView().getItemAnimator() != null) {
+            getListView().getItemAnimator().setMoveDuration(0);
+        }
 
         if (mTts == null || mCurrentDefaultLocale == null) {
             return;