Merge "Avoid the scenario Where taskdisplayarea is null" into sc-v2-dev am: 3767ba9926 am: b56e8efca6

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15581985

Change-Id: Id44ea143e76b978c59447f782553d9827cd74671

services/core/java/com/android/server/wm/ActivityStarter.java

@@ -1509,7 +1509,7 @@ class ActivityStarter {
         final Task targetTask = r.getTask() != null
                 ? r.getTask()
                 : mTargetTask;
-        if (startedActivityRootTask == null || targetTask == null) {
+        if (startedActivityRootTask == null || targetTask == null || !targetTask.isAttached()) {
             return;
         }