顶导添加判空保护

@@ -35,6 +35,9 @@ export struct TopNavigationComponent {
   @Link _currentNavIndex?: number;
   // 顶导当前选中/焦点下标
   @State currentTopNavSelectedIndex: number = 0;
+  /**
+   * @deprecated TODO，没地方用到，是否弃用
+   */
   @State currentTopNavName: string = '';
   @State currentTopNavItem: TopNavDTO = {} as TopNavDTO
   // 顶导数据
@@ -154,7 +157,7 @@ export struct TopNavigationComponent {
 
     // 崩溃
     // this.currentTopNavName = this._currentNavIndex === 0 ? this.myChannelList[0].name : this.topNavList[0].name
-    if (this._currentNavIndex === 0 && this.myChannelList && this.myChannelList.length > 0 &&
+    if (this._currentNavIndex === 0 && this.myChannelList && this.myChannelList.length > 0 && this.myChannelList[0] &&
     this.myChannelList[0].name) {
       this.currentTopNavName = this.myChannelList[0].name
     } else if (this._currentNavIndex != 0 && this.topNavList && this.topNavList.length > 0 && this.topNavList[0].name) {
@@ -170,19 +173,19 @@ export struct TopNavigationComponent {
     this.currentTopNavItem = this.myChannelList[this.currentTopNavSelectedIndex]
   }
 
-  isBroadcast(item: TopNavDTO) {
+  isBroadcast(item?: TopNavDTO) {
     // TODO 用id channelId = '2066'
-    return item.name === '播报'
+    return item?.name === '播报'
   }
 
-  isLayout(item: TopNavDTO) {
+  isLayout(item?: TopNavDTO) {
     // TODO 用id channelId = '2006'
-    return item.name === '版面'
+    return item?.name === '版面'
   }
 
-  isSpecialChannel(item: TopNavDTO) {
+  isSpecialChannel(item?: TopNavDTO) {
     // 版面、播报，可以用这个判断
-    return item.channelType === 3
+    return item?.channelType === 3
   }
 
 
@@ -374,7 +377,7 @@ export struct TopNavigationComponent {
   @Builder
   tabBarBuilder(item: TopNavDTO, index: number) {
     Column() {
-      Text(item.name)
+      Text(item?.name)
         .fontSize($r('app.float.selected_text_size'))
         .fontWeight(this.currentTopNavSelectedIndex === index ? FontWeight.Bold : FontWeight.Normal)
         .fontColor(this.currentTopNavSelectedIndex === index ? Color.Black : "#999999")