Tanggung jawab notaris atas surat kuasa membebankan hak tanggungan yang dinyatakan batal demi hukum oleh pengadilan studi kasus putusan nomor 55/PDT.G/PLW/2015/PN PKL = The responsibility of notary to authorization for the assignment of a mortgage which is stated null and void by law case study of pekalongan district court decision number 55/PDT.G/PLW/2015/PN PKL