Fixed crash with notification guts

Bug: 17350166
Change-Id: I4b5eb19b30e57486f48fa8c397e7450426f36464
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java b/packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
index 3f631f7..399742a 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
@@ -768,6 +768,8 @@
             final NotificationGuts v = mNotificationGutsExposed;
             mNotificationGutsExposed = null;
 
+            if (v.getWindowToken() == null) return;
+
             final int x = (v.getLeft() + v.getRight()) / 2;
             final int y = (v.getTop() + v.getActualHeight() / 2);
             final Animator a = ViewAnimationUtils.createCircularReveal(v,