2025.9.2 修改bug

lib/pages/home/study/strengthen_video_study_page.dart

@@ -166,6 +166,18 @@ class _StrengthenStudyPageState extends State<StrengthenStudyPage> {
       body: Column(
         children: [
           ListItemFactory.createBuildSimpleSection('加强学习课件'),
+          if(_videoList.isEmpty)
+          Stack(children: [
+            Container(
+              width: double.infinity,
+              height: 200,
+              color: Colors.white,
+              child: Center(
+                child:Text("暂未播放",
+                ),
+              ),
+            ),
+            if(_videoList.isNotEmpty)
             SizedBox(
               width: double.infinity,
               height: 250,
@@ -176,6 +188,9 @@ class _StrengthenStudyPageState extends State<StrengthenStudyPage> {
                 aspectRatio: _videoController?.value.aspectRatio ?? 16 / 9,
               ),
             ),
+          ],),
+
+
           Expanded(
             child: ListView.builder(
               padding: const EdgeInsets.all(12),