🐛[BUG] ProFormSelect在readonly模式下，传入空数组，这个字段会什么也不显示

### 🐛 bug 描述

ProFormSelect组件在readonly模式下，传入空数组，这个字段的值什么也不显示
如果传入空字符串，null之类的空值，会显示'-'
虽然这个组件类型上不支持emptyText，实际试了一下，emptyText在传空字符串或者null的时候是生效的

### 🏞 期望结果

希望能在传空数组的情况也显示有意义的空内容，最好能一起支持emptyText
大概看了下很多组件实际都支持emptyText，只是类型和文档里没有

### © 版本信息

- ProComponents 版本: 2.17.1
- 浏览器环境 chrome 130
- 开发环境 mac os

Start with the ProFormSelect component and trace its readonly rendering for an empty array, then compare it with the existing empty-string and null handling. Check how emptyText is currently accepted at runtime and represented in the component types and documentation; done means empty arrays show meaningful empty content and emptyText is consistently supported.

Written by the indexing model from the issue text.