Allow adding ID without populating link

This is not a core issue, but a restriction in editor_advanced_link. It's right in the original issue summary 😅

What @Wim_Leers said.

Editor_advanced_link is stripping out my empty links, including anchor tags. Core does too (by default), but it can be worked around like I describe below. I manage a Drupal 10.2.2 + CKEditor5 site that has pages containing tons of anchor tags e.g:

<a href="abc123"></a>

Those get removed when saving the node with editor_advanced_link is active.
With editor_advanced_link uninstalled, this also happens, but I can fix it by:

A) Enabling the CKEditor5 Source plugin
B) Adjusting that plugin's "Manually editable HTML tags" settings to include "".

After that I can add/edit/save textless '' anchor tags without issue.

I tested the above with Linkit uninstalled, so it is not in the mix here.

With editor_advanced_link installed, my 'Source editing' CKEditor5 plugin settings for get overridden by editor_advanced_link and show "The following attribute(s) can optionally be supported by enabled plugins and should not be added to the Source Editing "Manually editable HTML tags" field: Advanced links ()."

This happens even when I have not yet selected any of the attributes this module provides (aria-label, title, class, id, target, rel). As soon as I install this module, anchor tags / links with no text stop getting saved. I also tried enabling the 'Limit allowed HTML tags and correct faulty HTML' filter, which did not help.