[Panlingual] Fix NPE when add language.

Bug: b/232348161
Test: local

Change-Id: Ibd55603aebb72eea3e9b2b8c32177f73997cdeee

core/java/com/android/internal/app/LocalePickerWithRegion.java

@@ -340,7 +340,7 @@ public class LocalePickerWithRegion extends ListFragment implements SearchView.O
             inflater.inflate(R.menu.language_selection_list, menu);
 
             final MenuItem searchMenuItem = menu.findItem(R.id.locale_search_menu);
-            if (!mAppPackageName.isEmpty() && mOnActionExpandListener != null) {
+            if (!TextUtils.isEmpty(mAppPackageName) && mOnActionExpandListener != null) {
                 searchMenuItem.setOnActionExpandListener(mOnActionExpandListener);
             }