getPlaceholderMessage method 
    
      
String?
getPlaceholderMessage(
 - String? placeholderEmptyMessage
) 
    
    
  Implementation
  String? getPlaceholderMessage(String? placeholderEmptyMessage) {
  if (status.isLoading) {
    return null;
  }
  if (placeholderEmptyMessage != null) {
    return placeholderEmptyMessage;
  }
  if (status.isEmpty) {
    return kEmptyList;
  } else {
    if (status.errorMessage == kPlaceholderTitleBadResponse) {
      return kPlaceholderMessageBadResponse;
    } else if (status.errorMessage == kPlaceholderTitleConnection) {
      return kPlaceholderMessageConnection;
    }
  }
  return null;
}