[Feature Request] el-select 下拉框增加 不匹配显示空属性
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Description
### Existing Component
是
### Component Name
el-select
### Description
el-select 是否可以加一个配置,如果v-model与下拉框的项无法匹配显示空，而不是展示value
现在的问题是后端0 表示空 如果后端返回0,前端的下拉框因为没有 value=0的值,结果返回给0.
[截图](https://files.gitter.im/57d2b9ee40f3a6eec0646156/Jkhv/Tu-Pian.png)
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