Script to check notebooks: remove the she-bang and add two arguments to...

Script to check notebooks: remove the she-bang and add two arguments to circumvent an issue with UTF 8 encoding (fix suggested there: https://www.journaldunet.fr/web-tech/developpement/1441055-corriger-l-erreur-unicodedecodeerror-utf-8-codec-can-t-decode-byte-0xff-in-position-0-invalid-start-byte/).

Scripts/check_no_executed_cell.py

-#!python
-
 import argparse
 import sys
 from typing import Optional
@@ -8,7 +6,7 @@ from typing import Sequence
 
 def find_executed_cell(filename):
     """Read the file and check whether there is a line with "execution_count" and a non null value."""
-    stream = open(filename)
+    stream = open(filename, encoding="utf8", errors='ignore')
 
     executed_cells = [line.strip("\n,\" ") for line in stream if "execution_count" in line and "null" not in line ]