fix app page empty state

pigx-app-server/pigx-app-server-biz/src/main/java/com/pig4cloud/pigx/app/controller/AppPageController.java

@@ -55,7 +55,13 @@ public class AppPageController {
                 .orderByDesc(AppPageEntity::getCreateTime), false);
         List<AppTabbarEntity> tabbarList = tabbarService
                 .list(Wrappers.<AppTabbarEntity>lambdaQuery().orderByAsc(AppTabbarEntity::getSortOrder).orderByAsc(AppTabbarEntity::getId));
-        return R.ok(AppDecorateVO.of(appPage, tabbarList));
+        AppDecorateVO decorateVO = AppDecorateVO.of(appPage, tabbarList);
+        if (appPage == null) {
+            decorateVO.setPageType(pageType);
+            decorateVO.setPageName(PageTypeEnums.getNameByType(pageType));
+            decorateVO.setPageData("[]");
+        }
+        return R.ok(decorateVO);
     }
 
     /**