#!/usr/bin/env python3
#-*- coding: utf-8 -*-

def _no_index_error(func):
    """
    """
    def wrapper(*args, **kwargs):
        try:
            return func(*args, **kwargs)
        except IndexError:
            return
    return wrapper

a = [1]

@_no_index_error
def get_5_element(liste):
    return liste[4]

print(get_5_element(a))