Pull request #3139: 无JIRA任务 bugfix

Merge in VISUAL/fineui from ~GUY/fineui:master to master

* commit 'deca204416edf8e7586744446c71b0f7f13acbc2':
  bugfix

src/widget/singleselect/trigger/searcher.singleselect.js

@@ -128,7 +128,7 @@ BI.SingleSelectSearcher = BI.inherit(BI.Widget, {
         if (BI.isUndefined(v)) {
             this.editor.setState(BI.Selection.None);
         } else {
-            v = v || "";
+            v = v ?? "";
             this.editor.setState(o.valueFormatter(v + "") || (v + ""));
         }
     },