Pull request #2220: BI-94206 fix：populate时始终setText

Merge in VISUAL/fineui from ~JIMMY.CHAI/fineui:master to master

* commit 'e64cd5d11ab30c3ba71332d2d4c40aa9297a7d9b':
  BI-94206 fix：populate时始终setText

src/case/layer/pane.list.js

@@ -126,11 +126,11 @@ BI.ListPane = BI.inherit(BI.Pane, {
         var tipText = context.tipText || '';
         if (BI.isNotEmptyString(tipText)) {
             BI.ListPane.superclass.populate.apply(this, []);
-            this.setTipText(tipText);
         } else {
             BI.ListPane.superclass.populate.apply(this, arguments);
             this.button_group.populate.apply(this.button_group, arguments);
         }
+        this.setTipText(tipText || o.tipText);
     },
 
     empty: function () {