[VM] error when sending mail with non-ASCII characters

[Rainer J.H. Brandt]

Hi,

with 8.2.0b, I get this error when trying to send a mail containing
non-ASCII characters:

  vm-mime-encode-text-part: Wrong type argument: char-or-string-p, nil

I've looked at the latest NEWS file, but didn't find anything related.
I'd be grateful for any advice.

Thanks,
Rainer Brandt