status property 
    
      
      
  Reactive RxStatus of the Page being fetched.
May be:
- status.isEmpty, meaning the page is not fetched.
- status.isLoading, meaning the edges are being fetched.
- status.isLoadingMore, meaning some edges were fetched from local
storage.
- status.isSuccess, meaning the edges were successfully fetched.
Implementation
  final Rx<RxStatus> status = Rx(RxStatus.success());