Allow links with empty fragment

[mwcz]

fixes #1754

This makes links with an empty fragment (ex: [link to nothing](#)) pass the link checker.

IMPORTANT: Please do not create a Pull Request adding a new feature without discussing it first.

The place to discuss new features is the forum: https://zola.discourse.group/
If you want to add a new feature, please open a thread there first in the feature requests section.

Sanity check:

• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Code changes

(Delete or ignore this section for documentation changes)

• Are you doing the PR on the next branch?

If the change is a new feature or adding to/changing an existing one:

• Have you created/updated the relevant documentation page(s)? There's no relevant documentation that I could find (nor is any needed, IMO).

[Keats]

Thanks!