bug fix.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@34779 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/model/queue/AbstractQueueTask.java

@@ -39,7 +39,7 @@ import java.util.Collections;
  */
 public abstract class AbstractQueueTask implements Queue.Task {
     public Collection<? extends SubTask> getSubTasks() {
-        return Collections.emptyList();
+        return Collections.singleton(this);
     }
 
     public final Task getOwnerTask() {