Another machine_audit bugfix in callback plugin.
Another machine_audit bugfix in callback plugin.

AtlasOfLivingAustralia/ala-install,INBio/ala-install,AtlasOfLivingAustralia/ala-install,AtlasOfLivingAustralia/ala-install,AtlasOfLivingAustralia/ala-install,djtfmartin/ala-install,INBio/ala-install,INBio/ala-install,djtfmartin/ala-install,INBio/ala-install,sadeghim/ala-install,sadeghim/ala-install,sadeghim/ala-install,djtfmartin/ala-install,AtlasOfLivingAustralia/ala-install,djtfmartin/ala-install,sadeghim/ala-install