Appstream validate fails

[appcenter]

AppCenter tried to run appstreamcli validate on com.github.ztefn.haguichi and
received the following errors:

I - com.github.ztefn.haguichi.appdata.xml:com.github.ztefn.haguichi:47
    First 'description/p' paragraph might be too short (< 80 characters).

W - com.github.ztefn.haguichi.appdata.xml:com.github.ztefn.haguichi:168
    Found empty 'content_rating' tag.

Validation failed: warnings: 1, infos: 1

For more information, see:

• The AppStream Quickstart Guide
• The AppStream Metadata Specification

Build Information

Affects Architecture: amd64
Affects Distribution: juno
Built with the following references:

• refs/tags/1.141.0