Fixed deleting Automatic Keyword Group in the UI

[brunaoo]

fixes #9778

We fixed an issue preventing the deletion of an Automatic Keyword Group, when the group had no name.

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1. Change in `CHANGELOG.md` described in a way that is understandable for the average user (if applicable)
2. Tests created for changes (if applicable)
3. Manually tested changed features in running JabRef (always required)
4. [Checked documentation](https://docs.jabref.org/): Is the information available and up to date? If not, I created an issue at <https://github.com/JabRef/user-documentation/issues> or, even better, I submitted a pull request to the documentation repository.
5. Checked documentation: Is the information available and up to date? If not, I created an issue at https://github.com/JabRef/user-documentation/issues or, even better, I submitted a pull request to the documentation repository.

[calixtus]

Great, thanks for the addition. Looks good to me!