[JENKINS-25504] Trying to at least remove the trigger for the exceptions encountered when shutting down Jenkins.
Does not address the general possibility of the bogus NotSerializableException on Executor.
Does not have anything to do with actual interruption of an executor step
(as opposed to the InterruptedException thrown during shutdown).
Fixed display of progress bar in build history widget after a restart.
WorkflowRun.getExecutor is used by <t:buildProgressBar build="${build}"/>.
Comment about a display problem I do not know how to solve.