fixed bug when recyclerview is not attached in base class with header or footer sections

Author: scrinoman

omegarecyclerviewlibs/src/main/java/com/omega_r/libs/omegarecyclerview/header/HeaderFooterWrapperAdapter.java

@@ -34,6 +34,12 @@ public HeaderFooterWrapperAdapter(T adapter) {
         super.setHasStableIds(mRealAdapter.hasStableIds());
     }
 
+    @Override
+    public void onAttachedToRecyclerView(RecyclerView recyclerView) {
+        super.onAttachedToRecyclerView(recyclerView);
+        mRealAdapter.onAttachedToRecyclerView(recyclerView);
+    }
+
     @NonNull
     @Override
     public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {