I got Answer
  @Override
                    public void onDataChanged() {
                        if(dialog != null && dialog.isShowing()){
                            dialog.dismiss();
                        }
                        if(getItemCount() == 0){
                            remoteListRV.setVisibility(View.GONE);
                            msgTv.setVisibility(View.VISIBLE);
                            msgTv.setText("No "+ appType +" Available  !!!!");
                        }else {
                            remoteListRV.setVisibility(View.VISIBLE);
                            msgTv.setVisibility(View.GONE);
                        }
                    }
0
solved If there is data in query or Path it show data in FirestoreRecyclerAdapter. but when there is no data at that path