修复：处理更新日志为空的情况，提供默认提示文本

claude · claude · commit 23616873ee81 · 2026-01-11T15:25:02.000+08:00
diff --git a/Dialogs/ViewModels/UpdateViewModel.cs b/Dialogs/ViewModels/UpdateViewModel.cs
@@ -43,7 +43,9 @@ public UpdateViewModel(UpdateService updateService, UpdateInfo? updateInfo = nul
         if (_updateInfo != null)
         {
             Statistics.Version = _updateInfo.TargetFullRelease.Version.ToString();
-            ReleaseNotes = _updateInfo.TargetFullRelease.NotesMarkdown;
+            ReleaseNotes = !string.IsNullOrWhiteSpace(_updateInfo.TargetFullRelease.NotesMarkdown)
+                ? _updateInfo.TargetFullRelease.NotesMarkdown
+                : "暂无更新日志";
         }
         else
         {
@@ -61,7 +63,9 @@ private async Task CheckUpdatesAsync()
             if (_updateInfo != null)
             {
                 Statistics.Version = _updateInfo.TargetFullRelease.Version.ToString();
-                ReleaseNotes = _updateInfo.TargetFullRelease.NotesMarkdown;
+                ReleaseNotes = !string.IsNullOrWhiteSpace(_updateInfo.TargetFullRelease.NotesMarkdown)
+                    ? _updateInfo.TargetFullRelease.NotesMarkdown
+                    : "暂无更新日志";
             }
             else
             {

Original file line number	Diff line number	Diff line change
`@@ -43,7 +43,9 @@ public UpdateViewModel(UpdateService updateService, UpdateInfo? updateInfo = nul`
`43`	`43`	`if (_updateInfo != null)`
`44`	`44`	`{`
`45`	`45`	`Statistics.Version = _updateInfo.TargetFullRelease.Version.ToString();`
`46`		`- ReleaseNotes = _updateInfo.TargetFullRelease.NotesMarkdown;`
	`46`	`+ ReleaseNotes = !string.IsNullOrWhiteSpace(_updateInfo.TargetFullRelease.NotesMarkdown)`
	`47`	`+ ? _updateInfo.TargetFullRelease.NotesMarkdown`
	`48`	`+ : "暂无更新日志";`
`47`	`49`	`}`
`48`	`50`	`else`
`49`	`51`	`{`
`@@ -61,7 +63,9 @@ private async Task CheckUpdatesAsync()`
`61`	`63`	`if (_updateInfo != null)`
`62`	`64`	`{`
`63`	`65`	`Statistics.Version = _updateInfo.TargetFullRelease.Version.ToString();`
`64`		`- ReleaseNotes = _updateInfo.TargetFullRelease.NotesMarkdown;`
	`66`	`+ ReleaseNotes = !string.IsNullOrWhiteSpace(_updateInfo.TargetFullRelease.NotesMarkdown)`
	`67`	`+ ? _updateInfo.TargetFullRelease.NotesMarkdown`
	`68`	`+ : "暂无更新日志";`
`65`	`69`	`}`
`66`	`70`	`else`
`67`	`71`	`{`