A fire that occurred this Wednesday in a three-story hotel in the city of Mar del Plata was controlled by firefighters with no injuries reported, police and community sources reported.   The incident began after noon in a room on the top floor of the Tropea Hotel, located in Jujuy at 1300, in the macro-center of the resort town.   The fire was put out by members of the Mar del Plata Fire Department Headquarters, without anyone being affected, since there were no guests in the hotel at that time.   Police, municipal Civil Defense personnel and a unit of the Emergency Medical Care System also intervened at the scene, and the causes of the fire were being investigated.