Sailing with Hellig Olav missing (1904)

Emigration records from Kristiania (Oslo) show there was a sailing departing from Oslo on 25th August 1904. From the (very good) list of Hellig Olavs sailings on this site there is actually a 'hole' in the calendar that summer/fall. Where is it possible to check if the list is incomplete? The goal is to find this passenger list. Knut Skjauff