override jeg_get_author_option to avoid warning error

/* override jeg_get_author_option to avoid warning error */

function jeg_get_author_option( $value = null ) {
    $result  = array();
    $options = array_flip( jnews_get_all_author() );
    if ( empty( $options ) ) {
        if ( $value ) {
            $values = explode( ',', $value );
            foreach ( $values as $val ) {
                if ( ! empty( $val ) ) {
                    $user     = get_userdata( $val );
                    $result[] = array(
                        'value' => $val,
                        'text'  => $user->display_name,
                    );
                }
            }
        }
    } else {
        foreach ( $options as $key => $label ) {
            $result[] = array(
                'value' => $key,
                'text'  => $label,
            );
        }
    }
    return $result;
}