DirectReply: fix lockscreen crash

Fixes a crash that happens when direct reply is triggered and
the view is detached between clicking and unlocking.

Change-Id: I647560a24f9a26a28e86df436b45d5f496454eb8
Fixes: 32171748

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

@@ -4231,7 +4231,7 @@ public class PhoneStatusBar extends BaseStatusBar implements DemoMode,
         }
         updateKeyguardState(staying, false /* fromShadeLocked */);
 
-        if (viewToClick != null) {
+        if (viewToClick != null && viewToClick.isAttachedToWindow()) {
             viewToClick.callOnClick();
         }