'Remove the specified signatory from the provided course certificate'

@staticmethod
def remove_signatory(request, store, course, certificate_id, signatory_id):

    for (cert_index, cert) in enumerate(course.certificates['certificates']):
        if (int(cert['id']) == int(certificate_id)):
            for (sig_index, signatory) in enumerate(cert.get('signatories')):
                if (int(signatory_id) == int(signatory['id'])):
                    _delete_asset(course.id, signatory['signature_image_path'])
                    del cert['signatories'][sig_index]
                    store.update_item(course, request.user.id)
                    break
