Pembatalan perkawinan akibat perkawinan yang dilangsungkan tanpa wali nikah; studi kasus putusan Mahkamah Syari`yah nomor 113 /PDT. G /2012/ MS- Bna = Annulment of marriage as a consequent of a marriage without a presence of the marriage guardian; case study of Mahkamah Syari`yah decision number 113/ PDT,.G/ 2012/ Ms- Bna - Amwalyna Maisya, author (Fakultas Hukum Universitas Indonesia, 2014)