check dm state

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/pages/download/detail/widgets/item.dart

@@ -76,6 +76,8 @@ class DetailItem extends StatelessWidget {
                   );
                   if (res) {
                     SmartDialog.showToast('更新成功');
+                  } else {
+                    SmartDialog.showToast('更新失败');
                   }
                 },
                 dense: true,

lib/services/download/download_service.dart

@@ -315,11 +315,10 @@ class DownloadService extends GetxService {
 
         final danmaku = res.removeAt(0).data;
         for (var i in res) {
-          if (!i.isSuccess) {
-            throw i.toString();
-          }
+          if (i.isSuccess) {
             danmaku.elems.addAll(i.data.elems);
           }
+        }
         res.clear();
         await danmakuFile.writeAsBytes(danmaku.writeToBuffer());