页面报错 ：
tag 'select', field 'list': The requested list key 'userlist' could not be resolved as a collection/array/map/enumeration/iterator type. Example: people or people.{name} - [unknown location]
原因：页面中下拉菜单中的list集合为空。
解决方案：1、查看action中传递的list是否为空 2、 action是否有set方法
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