Merge "Ignore null action in DeviceIdleController." into main

    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {

        @Override public void onReceive(Context context, Intent intent) {

            switch (intent.getAction()) {

            final String action = intent.getAction();

            if (action == null) {

                return;

            }

            switch (action) {

                case ConnectivityManager.CONNECTIVITY_ACTION: {

                    updateConnectivityState(intent);

                } break;