How to "groupBy" PRs that don't have the labels at the end?

I don't want to specify every label, and some PRs don't need to have labels but should still be included in the release.

There doesn't seem to be a way to do that currently.

issue 中沒有指定檔案或測試。首先定位 release-note 分組和 groupBy 設定入口，然後追蹤目前如何處理沒有標籤的 pull request。完成的標準是：使用者可以省略完整的標籤清單，同時仍然包含沒有標籤的 pull request，並且對這種行為有文件說明，同時涵蓋有標籤和無標籤兩種情況。

由索引模型根據 Issue 內容生成。