[issue32634] Message parsing fails where it has incompele headers

[Maxim Barabanov]

New submission from Maxim Barabanov <maxim.barabanov at gmail.com>:

If email message dont have a content-transfer-encoding or content-type header, function write in generator.py crashes

----------
components: email
messages: 310485
nosy: barry, r.david.murray, reb00ter
priority: normal
severity: normal
status: open
title: Message parsing fails where it has incompele headers
type: crash
versions: Python 3.4, Python 3.5, Python 3.6

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32634>
_______________________________________