Fixed an issue where HUNS could have a background

Change-Id: I0537583321eed58461578259d038038a592889b6
Fixes: 32014780
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/stack/NotificationStackScrollLayout.java b/packages/SystemUI/src/com/android/systemui/statusbar/stack/NotificationStackScrollLayout.java
index 90e12ec..bc89db2 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/stack/NotificationStackScrollLayout.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/stack/NotificationStackScrollLayout.java
@@ -2002,6 +2002,7 @@
         if (!mIsExpanded) {
             mBackgroundBounds.top = 0;
             mBackgroundBounds.bottom = 0;
+            return;
         }
         ActivatableNotificationView firstView = mFirstVisibleBackgroundChild;
         int top = 0;