Before and after change to use Result

movie_repository.dart

// Before
Future<List<ContentDetailData>> getPopularMovies(int page) =>      
      _movieApi.getPopular(page).then((content) {
        if (content is ContentListResponse) {
          return _getMovies(content, true);
        }        
        return <ContentDetailData>[];
      });
// After
Future<Result> getPopularMovies(int page) => 
      _movieApi.getPopular(page).then((content) {
        if (content is ContentListResponse) {
          return _getMoviesWithResp(content, true);
        } else if (content is NoInternetResponse){
          return ErrorResult(ErrorCause.noInternet());
        }
        return ErrorResult(ErrorCause.unknown()
      });