weird bug with Gnus, can't have "^From" in `message-hidden-headers'

[Emanuel Berg]

I had this - try it, only with the "^From" line uncommented.

(setq message-hidden-headers '("^Face"
                               ;; "^From"
                               "^Mail-Copies-To"
                               "^References"
                               "^X-Draft-From"
                               "^X-Face") )

If you then send a mail, you get

  mail-extract-address-components: Invalid address: nil

I always thought that, `message-hidden-headers', a mere
interface setting so it took me several days to find this
bug ... I'll report it now.

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