Bitbucket: handle missing authentication response from API returning 404 status code

[glaubinix]

Bitbucket now seems to return a 404 status code with the below body if you access a repository you don't have access to

{"type": "error", "error": {"message": "The requested repository either does not exist or you do not have access. If you believe this repository exists and you have access, make sure you're authenticated."}}

[glaubinix]

Failing test case seems unrelated.

[Seldaek]

Thanks