Despite the headlining Ruslan Chagaev vs. Nicolay Valuev WBA heavyweight title rematch being called off, the show at Hartwell Arena in Helsinki, Finland went on as planned last night. Local man Juho Tolppola, 22-6-1 (9), failed in his bid to win the European Union light welter title from Italian evergreen Giuseppe Lauri, 48-6 (28), when…