the subversion plugin disables the job if it is set to poll for a repository (a branches/<versionnr> in my case) that does not exist (yet).

It would be convenient if this behavior can be disabled, e.g. by a setting 'Do not disable Job if repository does not exist', because now Jobs are disabled and need to be re-enabled somehow when the branch (or tag or project or...) becomes available.
With this change the Jenkins admin can prepare for projects/branches/... that do not exist yet but will in the near future.

See also JENKINS-10925: parameter substitution on the SVN url does not seem to work when validating the existence of a repository, which, when polling, results in a disabled job too.