Using Hudson 1.210, JIRA plugin 1.11, in an otherwise successful build, if an
svn checkin messsage contains a nonexistent JIRA issue id, the build fails when
JIRA throws a RemotePermissionException during the JIRA plugin's updating.
Perhaps a preference could control whether this would be treated as a failure,
instability or ignore it altogether. Some Subversion users don't allow checkin
messages to be edited, so JIRA updating would have to be disabled once a bad
issue id slipped past.