#9 parse tree section is empty if a comment contains non-ASCII characters

[Frank Probul]

If you use the section below, the "parse tree" section is empty if a comment contains non-ASCII characters
If you remove the 7 characters, everything works fine again.

---

require ["fileinto", "envelope", "variables"];
# German special characters äöüÄÖÜß 
# get rid of returned mail
if header :matches "Subject" "Undelivered Mail Returned to Sender"           { discard; stop; }