SPRINGFIELD — The pool of Republican candidates for attorney general may not be as crowded as the one for Democrats.But it could still be a fight with former Burr Ridge mayor Gary A. Grasso challenging Erika N.L. Harold, a partner with Champaign-based Meyer Capel P.C., for the GOP nomination.Grasso, of Grasso Bass, P.C., today said his 39 years as an attorney — seven years of which he spent as mayor and five in his current role on the DuPage County Board — give him the chops to be the state’s top …