fix: treat a fragment in an empty directory as an error

[ocavue]

No description provided.

[mre]

Looks good, thanks. Let's ship it!

[MichaIng]

Why is the PR adding 12 links, 8 good and 4 bad ones, but the test sees only 8 added links, 7 good and 1 bad? Also it checks only for 7 more links in the test output.

Are 4 links expected to not be detected as URIs, or excluded? If so, it should be maybe made clear in the file, and the test should check for detected URLs which are excluded as well.

EDIT: Ah, I guess local dir links with and without trailing slash are treated as identical, hence covered by internal cache? This applies for 3 links, so I am still missing one result, and a previously succeeding link not added here turned from success to failure it seems, probably expected.

[mre]

I guess local dir links with and without trailing slash are treated as identical, hence covered by internal cache?

Yes.