[Bug] <demo中填写级联，填写JSON就会出错>

### Have you read the Contributing Guidelines on issues?

- [X] I have read the [Contributing Guidelines on issues](https://github.com/JDFED/drip-form/blob/dev/CONTRIBUTING.md#reporting-new-issues).

### Prerequisites

- [X] I'm using the latest version of DripForm、DripFormTheme.
- [X] I have read the console error message carefully (if applicable).

### Description


### Steps to reproduce

1. 选择”级联选择“
2. 在样式->选项中填写，国家省份的JSON
[国家省份JSON](https://blog.csdn.net/weixin_38673922/article/details/132297153)
3.就会出现”发生错误，请联系管理员！“

### Current behavior


### Expected behavior

能够显示数据

### Your environment

- DripForm version used:
- DripFormTheme used:
- DripFormTheme version used:

### Reproducible demo

_No response_

### Self-service

- [ ] I'd be willing to fix this bug myself.