PUBLISHED IN THE HAMILTON SPECTATOR Thursday, December 5, 1997 NEED TO KNOW: THE TRAGICALLY HIP with Rheostatics, Copps Coliseum, Wednesday, December 11. Sold Out.   BY NICK KREWEN   Suppose you gave a performance and nobody came? According to Rob Baker, guitarist for Canadian rock icons The Tragically Hip, a Hamilton strip-and-rock club was the host for just such an astonishing occasion, much to the band’s chagrin. The era was…