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Verify canary release

• I verified that the issue exists in Next.js canary release

Provide environment information

Operating System:
  Platform: linux
  Arch: x64
  Version: #33~20.04.1-Ubuntu SMP Mon Feb 7 14:25:10 UTC 2022
Binaries:
  Node: 16.11.0
  npm: 8.0.0
  Yarn: N/A
  pnpm: N/A
Relevant packages:
  next: 12.1.0

Preliminary Checks

• This issue is not a duplicate. Before opening a new issue, please search existing issues: https://github.com/gatsbyjs/gatsby/issues
• This issue is not a question, feature request, RFC, or anything other than a bug report. Please post those things in GitHub Discussions: https://github.com/gatsbyjs/gatsby/discussions

Summary

Since Gatsby v3.0, `babel-p

是什么版本出现了此问题？

1.5.0-alpha.1

使用的什么数据库？

MySQL 8.x

使用的哪种方式部署？

Fat Jar

在线站点地址

https://halo.run

发生了什么？

比如 CommentProperties 中的 GRAVATAR_DEFAULT 属性的默认值为空字符串，那么在查询接口中不会返回此字段，期望返回此字段，因为在某些情况下空字符串是有意义的。

比如初始化系统之后：

<img width="571" alt="image" src="https