The url that is automatically added to the github status created by a multi-branch build (eg `URL/job/JOBNAME/job/BRANCHNAME/BUILDNUMBER/display/redirect`) redirects to a 404 URL that contains an extra forward slash.

Example:

`BASEURL//blue/organizations/jenkins/JOBNAME/detail/BRANCHNAME/BUILDNUMBER/`

should be

`BASEURL/blue/organizations/jenkins/JOBNAME/detail/BRANCHNAME/BUILDNUMBER/`

If I remove one of the slashes, it works.