MADRID (Reuters) – A Spanish arbitrator who awarded $15 billion to the descendants of a former sultan in a land dispute with Malaysia dating back to the 19th century has been convicted of contempt of court, it was announced on Monday, a significant victory in Malaysia’s efforts to annul the case. Gonzalo Stampa was accused by the Spanish state prosecutor and Malaysia of failing to comply with a Madrid court ruling to drop the case by instead moving it to a court in Paris. Stampa was sentenced to six months in jail and barred from operating for one year, according to the ruling. In February 202…