IOWA CITY — An Iowa journalist faces trial today on charges stemming from her coverage of a protest against racial injustice, a case that prosecutors have pursued despite international condemnation from free press advocates who say she was just doing her job.The case of Des Moines Register reporter Andrea Sahouri, who was pepper sprayed and arrested while reporting on a clash between protesters and police, will highlight an aggressive response by Iowa authorities against those who organized and attended protests that erupted last summer and occasionally turned violent.Sahouri and her former boyfriend are charged with failure to disperse and interference with official acts, misdemeanors that could bring fines and up to 30 days in jail.