FIX Correctly throw exception when user has invalid permissions to export
FIX Correctly throw exception when user has invalid permissions to export

silverstripe-australia/advancedworkflow,silverstripe-australia/silverstripe-advancedworkflow,silverstripe-terraformers/advancedworkflow,silverstripe-terraformers/advancedworkflow,silverstripe-australia/advancedworkflow,silverstripe-australia/silverstripe-advancedworkflow