fix: 导航栏中没有active菜单时客户端脚本出错

#Comment
菜单动画效果失败导致，无法计算 $navItem.offset().top

Bootstrap.Admin/wwwroot/js/common-scripts.js

@@ -145,7 +145,7 @@ $(function () {
         autoScrollSidebar: function (options) {
             var option = $.extend({ target: null, offsetTop: 0 }, options);
             var $navItem = option.target;
-            if ($navItem === null) return this;
+            if ($navItem === null || $navItem.length === 0) return this;
 
             // sidebar scroll animate
             var middle = this.outerHeight() / 2;