The absence of starting left tackle Ronnie Stanley from Thursday morning’s practice was startling, but not to Ravens coach John Harbaugh. Harbaugh said after practice that Stanley, who has started 13 of 14 games, did not participate Thursday because of an illness. The 2016 first-round pick was listed as questionable for Saturday’s game against the Indianapolis Colts at M&T Bank Stadium, which suggests he will start. Asked about his level of concern regarding Stanley’s absence, Harbaugh replied: “No concern. He’s just sick. He’s just getting over something. [Outside linebacker] Matt Judon had something yesterday. It’s that time of year.”