If the run result is opened and no run or job exists it should go to the 404 page.
Follow up work of
JENKINS-39809, this part should cover:
- mobx returns always an answer
- response object should contain at least data and error attributes, maybe a generic state as well
- use this new code to fix 404 with patterns
where this comes from ATH smoke test and the last url stands for a detail view of a build number that not yet exists.