[[ https://archive.softwareheritage.org/browse/origin/directory/?origin_url=https://gitorious.org/worldview/worldview-gitorious-wiki.git | this repo ]] points to an [[ https://archive.softwareheritage.org/browse/snapshot/06aa59fa9a87b85f171bc1529d41a04c4bff18cd/directory/ | empty snapshot ]] (see the Web API for [[ https://archive.softwareheritage.org/api/1/snapshot/06aa59fa9a87b85f171bc1529d41a04c4bff18cd/ | further details ]]), but when visiting them via the Web UI the user message is "NotFoundExc: Snapshot with id 06aa59fa9a87b85f171bc1529d41a04c4bff18cd not found!".
We should just say that the repo/snapshot is empty, as no user would understand the meaning of the current message.