A high court case on liability for court-appointed guardians has drawn the interest of one of the state’s most influential legal associations.The Illinois Trial Lawyers Association has asked the state’s top court to uphold a ruling that guardians ad litem are not immune from negligence claims.A friend-of-the-court brief filed by the plaintiffs’ group in the case of Alexis Nichols v. David M. Fahrenkamp, slated to be heard by the Illinois Supreme Court on Wednesday, argues no relevant state law grants …