Fix an issue in the API where a null auditor_setting throws an exception
The ItemAudit's auditor_setting_id can be null. Not sure why, but if it's null
it raises an Exception. This will ignore this and skip showing the issues in these cases.
Coverage remained the same at 68.329% when pulling 899b74f0f99c989d77e41ebe27e21c374771e959 on nullauditor into f7e51ddff80f43593ec000e305ee24aa96611feb on develop.
Fix an issue in the API where a null auditor_setting throws an exception