Fixes issue where RecyclerView is throwing an IllegalArgumentException when trying to recycler view holders. Because the library was adding a view to the parent ViewGroup in onCreateGhostHeaderViewHolder, when the RecyclerView tried to recycle the ViewHolder it checked if the parent ViewGroup is not null. If the ViewGroup is not null, the RecyclerView will throw an IllegalArgumentException.
Fixes issue where RecyclerView is throwing an IllegalArgumentException when trying to recycler view holders. Because the library was adding a view to the parent ViewGroup in onCreateGhostHeaderViewHolder, when the RecyclerView tried to recycle the ViewHolder it checked if the parent ViewGroup is not null. If the ViewGroup is not null, the RecyclerView will throw an IllegalArgumentException.