'Return the name of the current indicator in a field.'

def indicator_for_field(self, field_id):

    self.wait_for_field(field_id)
    query = self.q(css='.u-field-{}    .u-field-message    .fa'.format(field_id))
    return ([class_name for class_name in query.attrs('class')[0].split('    ') if class_name.startswith('message')][0].partition('-')[2] if query.present else None)
