Pull request #2209: BI-94865 fix: 资源交接下拉框中默认选中了空值

Merge in VISUAL/fineui from ~WINDY/fui:master to master

* commit 'c0dc297f0914f4011f471a26bae9bf5d1aac487b':
  BI-94865 fix: 默认值为null对继承single的组件相当于设置了null为值

src/base/single/0.single.js

@@ -17,7 +17,6 @@ BI.Single = BI.inherit(BI.Widget, {
             title: null,
             warningTitle: null,
             tipType: null, // success或warning
-            value: null,
             belowMouse: false   // title是否跟随鼠标
         });
     },