When the input SWHID to browse in an iframe does not have any snapshot
related qualifiers, the generated link to browse the object in the
main archive website was invalid and was leading to HTTP errors.
For instance, in that [directory view](https://archive.softwareheritage.org/embed/swh:1:dir:b5b306ab4da7b89898c42c3e2bd4b9e99cd2b810;path=/base/?focus_swhid=swh:1:dir:557869d98df80317f2d7835460388cfc41414aa5), clicking
on the `View in the archive` link leads to a 404 error.