[update] skip empty returncode checks in database
[update] skip empty returncode checks in database

This is not meant to happen but since I encountered those empty entries
and empty returncode check is not shown in package form, we can safely
drop them during the upgrade process.

fusioninventory/fusioninventory-for-glpi,TECLIB/fusioninventory-for-glpi,TECLIB/fusioninventory-for-glpi,fusioninventory/fusioninventory-for-glpi,dethegeek/fusioninventory-for-glpi,TECLIB/fusioninventory-for-glpi,orthagh/fusioninventory-for-glpi,itinside/fusioninventory-for-glpi,itinside/fusioninventory-for-glpi,itinside/fusioninventory-for-glpi,dethegeek/fusioninventory-for-glpi,dethegeek/fusioninventory-for-glpi,orthagh/fusioninventory-for-glpi,fusioninventory/fusioninventory-for-glpi,itinside/fusioninventory-for-glpi,mohierf/fusioninventory-for-glpi,mohierf/fusioninventory-for-glpi,TECLIB/fusioninventory-for-glpi,TECLIB/fusioninventory-for-glpi,fusioninventory/fusioninventory-for-glpi,orthagh/fusioninventory-for-glpi,orthagh/fusioninventory-for-glpi,fusioninventory/fusioninventory-for-glpi,mohierf/fusioninventory-for-glpi,mohierf/fusioninventory-for-glpi,itinside/fusioninventory-for-glpi,dethegeek/fusioninventory-for-glpi,mohierf/fusioninventory-for-glpi,TECLIB/fusioninventory-for-glpi,mohierf/fusioninventory-for-glpi,orthagh/fusioninventory-for-glpi,fusioninventory/fusioninventory-for-glpi