(Changes sourcing, adds request for comment to local bishops association) Dec 20 (Reuters) - Nicaragua arrested another Catholic bishop on Wednesday, a source in close contact with local church leaders told Reuters following local media reports, making the bishop the second such leader to be detained in a prolonged crackdown. Police arrested Bishop Isidro Mora of the Triangulo Minero diocese, located along the country's northern Caribbean coast, according to the source. Local news outlets including Despacho 505 and La Prensa earlier on Wednesday reported that Mora was arrested for the crime of praying for his fellow detained bishop , Rolando...