bug fix for PPOCRLabel.exportJSON NameError: name 'null' is not defined #9695
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解决识别文本概率出现null导致导出表格标注时闪退的问题
![223900129-8d80b9d9-2d82-4f1d-84b9-795f66600fc7](https://user-images.githubusercontent.com/65639657/231083799-d1ab3e8e-671f-4e49-b6cf-367e137d5c4d.png)