Properly handle situation when currentOpPackageName returns null.

Fixes: 158309330
Test: adb shell content query --uri content://com.android.contacts/data --projection  contact_id:raw_contact_id:_id:display_name:last_time_used:data1:account_type:mimetype
Change-Id: I6c5d0c4fef150ba45721d474ac0f83778d543467

core/java/android/app/AppOpsManager.java

@@ -261,8 +261,9 @@ public class AppOpsManager {
                             < SystemClock.elapsedRealtime()) {
                         String stackTrace = getFormattedStackTrace();
                         try {
+                            String packageName = ActivityThread.currentOpPackageName();
                             sConfig = getService().reportRuntimeAppOpAccessMessageAndGetConfig(
-                                    ActivityThread.currentOpPackageName(), op, stackTrace);
+                                    packageName == null ? "" : packageName, op, stackTrace);
                         } catch (RemoteException e) {
                             e.rethrowFromSystemServer();
                         }