syntax-highlighting: replace invalid unicode with ?

filters/syntax-highlighting.py

@@ -30,8 +30,8 @@ from pygments.lexers import guess_lexer_for_filename
 from pygments.formatters import HtmlFormatter
 
 
-sys.stdin = io.TextIOWrapper(sys.stdin.buffer, encoding='utf-8')
+sys.stdin = io.TextIOWrapper(sys.stdin.buffer, encoding='utf-8', errors='replace')
-sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-8')
+sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-8', errors='replace')
 data = sys.stdin.read()
 filename = sys.argv[1]
 formatter = HtmlFormatter(style='pastie')