fix UnmarshalGuFactor bug for extra is "{} or {"gufactor1":"0.1"}"

[BananaLF]

• Targeted PR against correct branch (see CONTRIBUTING.md)

• [ ] Linked to github-issue with discussion and accepted design OR link to spec that describes this work.

• [ ] Wrote tests

• [ ] Updated relevant documentation (docs/)

• [ ] Added a relevant changelog entry to the Unreleased section in CHANGELOG.md

• [ ] Reviewed Files changed in the github PR explorer

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[BananaLF]

This PR is draft for merge with wasm release. because it's may be cause chain smb.