Pipelines links result in 404 and no way to get to external status provider
Summary
When you use an external status provider for checking commits and have Build disabled on GitLab, there are lots of links to pipelines which result in 404 pages and there is no way to get to the external status provider in order to see details.
Steps to reproduce
I've no real clue what steps are needed, an example can be seen here:
The "Builds" Feature is disabled and I use AppVeyor for build statuses.
Since the Build-tab is gone now, there is no way to get to the status page of AppVeyor, the service I use for external statuses.
Expected behavior
If there is no pipeline, the link on the commits view should point to the external server OR a commit status page listing all external services of there is more than one.