removeContinueNodes(duration) {
    if (this.continueNode != null) {
      if (duration == null) { duration = 0.0; }
      this.removeInteractiveElement(this.continueNode);
      this.continueNode.destroy(duration);
      this.continueNode = null;
    }
  }
Removes current continue node(s).
@param {Number} [duration=0.0] time in seconds