This works:

        // filter results        
        var list = this.listResults.result.row.select(function(row) {
            return (row.sess == self.resultsFilter.session || 
self.resultsFilter.session == null) && 
                (row.level == self.resultsFilter.level || 
self.resultsFilter.level == null) && 
                    (row.div == self.resultsFilter.division || 
self.resultsFilter.division == null);
        });
        
Not certain why former example did not work.  I'll stick with the latter, 
but still curious about the issue with the former.
Karl..

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