DO NOT MERGE Do not reinflate the layout if it has not been already inflated.

This fixes the NPE caused when reinflate method is called before the
layout is inflated.

Bug: 180534861
Test: Manual
Change-Id: Ia3fb6867e55c63a5fe7c17df1c3f86d048b4d1a8

packages/CarSystemUI/src/com/android/systemui/car/notification/NotificationPanelViewController.java

@@ -240,6 +240,9 @@ public class NotificationPanelViewController extends OverlayPanelViewController
 
     /** Reinflates the view. */
     public void reinflate() {
+        // Do not reinflate the view if it has not been inflated at all.
+        if (!isInflated()) return;
+
         ViewGroup container = (ViewGroup) getLayout();
         container.removeView(mNotificationView);