Merged revision(s) 1558774 from ofbiz/trunk:
Small rewrite in JobManager.java to fix a bug where jobs could be duplicated under certain conditions. https://issues.apache.org/jira/browse/OFBIZ-5496


git-svn-id: https://svn.apache.org/repos/asf/ofbiz/branches/release13.07@1558779 13f79535-47bb-0310-9956-ffa450edef68