Fix a bug where script would crash due to paths being normalised

normalisename.py

@@ -20,9 +20,8 @@ for path in argv[1:]:
                joinpath
                (
                    dir,
-                   ''.join(ch for ch in file
+                   ''.join(ch for ch in file.replace(' ', '_')
                            if ch.isalnum()
                            or ch in whitelist)
                )
-           )
+           ))
-           .replace(' ', '_'))