[JENKINS-47458] - Check for null in Connection#getReasonClosedCause()

[oleg-nenashev]

Just caught it in SSH Slaves plugin tests on my local machine: https://issues.jenkins-ci.org/browse/JENKINS-47458

Not sure whether null is valid though

@reviewbybees @paladox @mc1arke

[ghost]

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[jglick]

Fix the CI build please: add Jenkinsfile and disable old job.

[oleg-nenashev]

For now fixed the Java version in the current CI setup

[oleg-nenashev]

@paladox @mc1arke any plans regarding the new release?

[paladox]

@oleg-nenashev hi, not sure as @mc1arke has the merge rights :)

[oleg-nenashev]

@mc1arke gentle ping

[oleg-nenashev]

@reviewbybees done

[oleg-nenashev]

@paladox @mc1arke FYI there is a query from @kuisathaverat : https://groups.google.com/forum/#!topic/jenkinsci-dev/z-uIydVxqMM . Maybe he could help with delivering bits there

[kuisathaverat]

I will try to take a look at it this week

[oleg-nenashev]

@kuisathaverat do you plan to update the versions in the Jenkins core at some point?