انا استلم بيانات من api هنا ف future builder حطيت الشروط بس شرط snapshot.haserror لا يتفعل بس يظهر لي صفحة بيضاء بعد ال indicator

class NewsListViewBuilder extends StatefulWidget {

  const NewsListViewBuilder({

    super.key,

    required this.category,

  });

  final String category;



  @override

  State<NewsListViewBuilder> createState() => _NewsListViewBuilderState();

}



class _NewsListViewBuilderState extends State<NewsListViewBuilder> {

  var data;

  @override

  void initState() {

    data = NewsService(Dio()).getTopHeadlines(category: widget.category);

    super.initState();

  }



  @override

  Widget build(BuildContext context) {

    return FutureBuilder<List<ArticleModel>>(

        future: data,

        builder: (context, snapshot) {

          if (snapshot.hasData) {

            return NewsListView(

              results: snapshot.data!,

            );

          } else if (snapshot.hasError) {

            return const SliverToBoxAdapter(

                child: Text('Oops  Was An Error Pls  ...... Try Later ..... '));

          } else {

            return const SliverToBoxAdapter(

                child: Center(

                    child: CircularProgressIndicator(

              backgroundColor: Colors.white,

              color: Colors.orange,

            )));

          }

        });

  }

}

وهذه صفحة البيانات اللي استلمها 

import 'package:__news/models/article_model.dart';

import 'package:dio/dio.dart';



class NewsService {

  final Dio dio;



  NewsService(this.dio);  //entertainment



  Future<List<ArticleModel>> getTopHeadlines

  ({required String category}) async {

    try {

  var response = await dio.get(

      'https://newsdata.io/api/1/news?country=eg&apikey=pub_28251d32085b71e2ec486b53a77e25ee953ba&category=$category');

  Map<String, dynamic> jsonData = response.data;



  List<dynamic> results = jsonData['results'];



  List<ArticleModel> resultsList = [];



  for (var result in results) {

    ArticleModel articleModel = ArticleModel(

        image: result['image_url'],

        title: result['title'],

        subTitle: result['description']);



    resultsList.add(articleModel);

  }

  return resultsList;

}  catch (e) {

      return [];

}

  }

}