fix：BaseListWidget-首页数据加载失败时，清空数据；

lib/widget/base_list_widget.dart

@@ -164,12 +164,14 @@ class _BaseListWidgetState extends State<BaseListWidget> {
     }
     _stateType = StateType.error;
     ToastUtil.showToast(msg);
-    setState(() {});
     if (_page == 1) {
+      _dataList.clear();
+      _count = _dataList.length;
       _controller.finishRefresh();
     } else {
       _controller.finishLoad();
     }
+    setState(() {});
   }
 
   /// Build header.