After upgrading to 11.11 the Filtering in some Kanban Boards does not work anymore.

This seems to be related to Trackers with fields of type "Openlist". When there is an artifact with an empty openlist filed the filtering throws that error.

We identified the following code to be the problem:

case "sb": 
case "rb": 
case "cb": 
case "tbl": 
case "msb": 
case "shared": 
    return card_field.values.some(function(value)
       { if (typeof value.display_name !== "undefined") 
            { return match(value.display_name); 
       } 
       return match(value.label); 
    });