JSY-26262 fix: multi_select_insert_no_bar_list 结果为空时，提示居中

src/widget/multiselect/multiselect.loader.nobar.js

@@ -99,9 +99,9 @@ BI.MultiSelectNoBarLoader = BI.inherit(BI.Widget, {
         }, opts.el));
 
         BI.createWidget({
-            type: "bi.vertical",
+            type: "bi.absolute",
             element: this,
-            items: [this.button_group],
+            items: [{el: this.button_group, inset: 0}],
             vgap: 5
         });