CNY-1814 - ourJobList could contain empty oldVersions if forceLocalGeneration is True, which could happen if the server is down.  So handle the case where old is None
CNY-1814 - ourJobList could contain empty oldVersions if forceLocalGeneration
is True, which could happen if the server is down.  So handle the case where
old is None

sassoftware/conary,sassoftware/conary,sassoftware/conary,sassoftware/conary,sassoftware/conary