A federal jury has convicted the once-top aide to former Illinois House Speaker Michael Madigan, finding Tim Mapes guilty on charges of perjury and attempted obstruction of justice for lying to a grand jury investigating Madigan and his inner circle.The jury of six men and six women reached its verdict in a little more than five hours. Mapes, who spent more than 25 years as Madigan’s chief of staff, sat stone-faced between his attorneys at the defense table while Judge John Kness read the verdict Thursday afternoon.As the …