Fix NPE when instantiating SettingsPreferenceFragment

Change-Id: I3997d6436f358b802dff9be307c36031f4351ab4
Fixes: 72868191
Test: robotests

src/com/android/settings/SettingsPreferenceFragment.java

@@ -339,8 +339,10 @@ public abstract class SettingsPreferenceFragment extends InstrumentedPreferenceF
 
     @Override
     protected RecyclerView.Adapter onCreateAdapter(PreferenceScreen preferenceScreen) {
+        final Bundle arguments = getArguments();
         mAdapter = new HighlightablePreferenceGroupAdapter(preferenceScreen,
-                getArguments().getString(SettingsActivity.EXTRA_FRAGMENT_ARG_KEY),
+                arguments == null
+                        ? null : arguments.getString(SettingsActivity.EXTRA_FRAGMENT_ARG_KEY),
                 mPreferenceHighlighted);
         return mAdapter;
     }