PHOENIX — The Chicago Bulls returned home empty-handed from a three-game West Coast trip after a 129-102 blowout loss to the Phoenix Suns, sending the team to its third straight loss and eighth in 10 games. The Bulls threw in the towel with four minutes left on the clock as both teams subbed out their starters in the drubbing. The loss marked the second-straight game in which the Bulls ceded 125 points or more. The Bulls headed West ready to be tested. The Suns and the Utah Jazz are among the best in the opposing conference, and coach Billy Donovan welcomed the challenge as a chance to prepare…