Fix NPE in onAnimationEnd when using Sequencer.after(long)

         */

        public void after(long delay) {

            // setup dummy Animator just to run the clock

            Animator anim = new Animator(delay, 0f, 1f);

            Node node = new Node(anim);

            mNodes.add(node);

            Dependency dependency = new Dependency(node, Dependency.AFTER);

            mCurrentNode.addDependency(dependency);

            after(new Animator(delay, 0f, 1f));

        }

    }