BI-92467 fix:下拉树控件父节点下有空值，勾选空值，过滤条件显示应该为 父结点值:;

src/widget/multitree/trigger/searcher.multi.tree.js

@@ -136,7 +136,7 @@ BI.MultiTreeSearcher = BI.inherit(BI.Widget, {
             var names = BI.Func.getSortedResult(BI.keys(value));
             BI.each(names, function (idx, name) {
                 var childNodes = getChildrenNode(value[name]);
-                text += (name === "null" ? "" : (o.valueFormatter(name + "") || name)) + (childNodes === "" ? "" : (":" + childNodes)) + "; ";
+                text += (name === "null" ? "" : (o.valueFormatter(name + "") || name)) + (childNodes === "" ? (BI.isEmptyObject(value[name]) ? "" : ":") : (":" + childNodes)) + "; ";
                 if (childNodes === "") {
                     count++;
                 }