Even as injuries mount, 'Spider-Man' execs vow show must go on by JOE DZIEMIANOWICZ, HEIDI EVANS and CORKY SIEMASZKO, DAILY NEWS STAFF WRITERS

Dogged by talk of a curse, "Spider-Man" producers vowed Tuesday the star-crossed show would go on despite a shocking fall that could have killed its top stunt man. Christopher Tierney wasn't…