修复 BuildSelect 项目控件

src/components/SelectButton/BuildSelect.jsx

     setValue(e)
     props.onChange(e)
   }
-
+  // '' === value ? undefined : value
   return (
       <Select
       showSearch
-      value={'' === value ? undefined : value}
+      value={props.value}
       style={{ width: '180px' }} 
       placeholder="请选择项目" 
       onChange={handleChange}