status property 
    
      
      
  Status of a chat fetching.
May be:
- status.isLoading, meaning chat is being fetched from the service.
- status.isEmpty, meaning chat with specified id was not found.
- status.isSuccess, meaning chat is successfully fetched.
- status.isLoadingMore, meaning chat is already displayed and an
additional data is being fetched.
Implementation
  Rx<RxStatus> status = Rx<RxStatus>(RxStatus.loading());