fix: 优化逻辑

backend/src/main/java/com/yfd/platform/system/service/impl/SysMenuServiceImpl.java

@@ -453,6 +453,9 @@ public class SysMenuServiceImpl extends ServiceImpl<SysMenuMapper, SysMenu> impl
         } else {
             sysMenuList = sysMenuMapper.selectMenuByUserId(id, tenantId);
         }
+        if (sysMenuList==null||sysMenuList.isEmpty()) {
+            throw new RuntimeException("无菜单");
+        }
         // 将 SysMenu 转换为 Map 并构建树
         List<Map<String, Object>> list = sysMenuList.stream()
                 .map(menu -> {