In scope
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

const pager = { data, error, state }

// then in view

if (pager.error) {
  return <NotFound/>;
}

// and to get rid of pager.$pending
if (pager.state === 'PENDING') {
 return null;
}

• use this new code to fix 404 with patterns

 '/blue/organizations/gibtEsNicht', '/blue/organizations/jenkins/my-pipeline/detail/my-pipeline/20/pipeline'

where this comes from ATH smoke test and the last url stands for a detail view of a build number that not yet exists.

dogfood context
https://ci.jenkins.io/blue/organizations/jenkins/Infra%2Fpatron/detail/PR-16/1/pipeline/