Getting NullPointerException on 1.1.5 with DefaultSliderView

With this code that works correct on 1.1.2, and I neet to upgrade to 1.1.5 because I need to use the new onPageChangeListener.

``` java
public void addPhoto(File photo) {
DefaultSliderView sliderView = new DefaultSliderView(this);
sliderView.description(photo.getName())
.image(photo)
.empty(R.drawable.imgnotfound)
.error(R.drawable.imgnotfound)
.setScaleType(BaseSliderView.ScaleType.CenterCrop)
.setOnSliderClickListener(this);
sliderView.getBundle().putString("extra", photo.getName());
slider.addSlider(sliderView);
}
```