Calling SectionTitleProvider.getSectionTitle with negative (-1) index

[dmitry-novikov]

FastScroller is trying to get section title for item with negative index when RecyclerViews items are cleared while in active scroll with section bubble visible. That can lead to ArrayIndexOutOfBoundsException in application code.

java.lang.ArrayIndexOutOfBoundsException: length=0; index=-1
    at java.util.ArrayList.get(ArrayList.java:310)
    at my.Adapter.getSectionTitle(MyAdapter.java:123)
    at com.futuremind.recyclerviewfastscroll.FastScroller.setRecyclerViewPosition(FastScroller.java:250)
    at com.futuremind.recyclerviewfastscroll.FastScroller.access$500(FastScroller.java:21)
    at com.futuremind.recyclerviewfastscroll.FastScroller$2.onTouch(FastScroller.java:195)
    at android.view.View.dispatchTouchEvent(View.java:9371)