[Bug] 复制空单元格粘贴到其他单元格时会自动填充'undefined'

[xiaoosnggao]

Version

0.21.1

Link to Minimal Reproduction

https://codesandbox.io/p/sandbox/react-vtable-forked-4g4rr2?file=%2Fsrc%2Findex.tsx%3A493%2C11-493%2C18

Steps to Reproduce

1.records的数据中某些字段不存在
2.复制不存在字段的单元格
3.粘贴到其他单元格
4.粘贴进去的内容为'undefined'

Current Behavior

Expected Behavior

应该粘贴为空字符串

Environment

- OS:macos
- Browser:google chrome
- Framework:react@17

Any additional comments?

No response