fix: check initialization before playing

lib/pages/video/detail/controller.dart

@@ -74,8 +74,8 @@ class VideoDetailController extends GetxController
 
   late VideoItem firstVideo;
   late AudioItem firstAudio;
-  late String videoUrl;
-  late String audioUrl;
+  String? videoUrl;
+  String? audioUrl;
   late Duration defaultST;
   // 亮度
   double? brightness;

lib/pages/video/detail/view.dart

@@ -208,6 +208,11 @@ class _VideoDetailPageState extends State<VideoDetailPage>
 
   /// 未开启自动播放时触发播放
   Future<void> handlePlay() async {
+    if (videoDetailController.videoUrl == null ||
+        videoDetailController.audioUrl == null) {
+      SmartDialog.showToast('not initialized');
+      return;
+    }
     videoDetailController.isShowCover.value = false;
     await videoDetailController.playerInit();
     plPlayerController = videoDetailController.plPlayerController;