Collapse Notification panel after tapping CLEAR ALL button

Usually, notification panel is automatically collapsed
after tapping "CLEAR ALL" button but is not collapsed
if all dismissable notifications are scrolled out.

In this case, dismissed notification is still displayed
until notification panel is once collapsed.
And that "dismissed" notification causes several issues.

To avoid this, collapse notification panel automatically
after tapping "CLEAR ALL" button even when all dismissable
notifications are scrolled out.

Fixes: 67246876
Test: manual - post ongoing and dismissable notifications,
               and tap CLEAR ALL button.

Change-Id: I048255cde6fdb4cedd2c3472e345ff63c744af68

packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.java

@@ -1440,6 +1440,11 @@ public class StatusBar extends SystemUI implements DemoMode,
             }
         };
 
+        if (hideAnimatedList.isEmpty()) {
+            animationFinishAction.run();
+            return;
+        }
+
         // let's disable our normal animations
         mStackScroller.setDismissAllInProgress(true);