fix |> 空串解析json报错

Signed-off-by: xugenyuan <xugenyuan@wondertek.com.cn>

@@ -13,6 +13,7 @@ import { BusinessError } from '@kit.BasicServicesKit';
 import { BottomNavigationComponent } from './view/BottomNavigationComponent';
 import LaunchDataModel from './viewModel/LaunchDataModel';
 import { LaunchPageModel } from './viewModel/LaunchPageModel';
+import { JSON } from '@kit.ArkTS';
 
 const TAG = 'MainPage';
 
@@ -46,14 +47,19 @@ struct MainPage {
       LogoutViewModel.clearLoginInfo()
     })
 
+    let GrayManage = new GrayManageModel()
     let dataModelStr : string = SPHelper.default.getSync(SpConstants.APP_MOURNS_INFO_DATA_MODEL,'') as string
-    let dataModel : LaunchDataModel = JSON.parse(dataModelStr)
-    // console.log(dataModelStr)
+    try {
+      if (dataModelStr && dataModelStr.length > 0) {
+        let dataModel : LaunchDataModel = JSON.parse(dataModelStr) as LaunchDataModel
         // 处理国殇模式数据
         let mourns: mournsInfoModel = dataModel.mourns as mournsInfoModel
-    let GrayManage = new GrayManageModel()
         GrayManage.setMourning(mourns)
+      }
       AppStorage.setOrCreate('GrayManage', GrayManage)
+    } catch (e) {
+      Logger.error(TAG, `Unexpected Text in JSON ??` + JSON.stringify(e) +"  " + dataModelStr);
+    }
   }
 
   pageTransition() {