New submission from Brandon Craig Rhodes <bran...@rhodesmill.org>:

If you try doing "msg.as_string()" to a MIMEMultipart message that has not been 
given a boundary, then it dies with this exception:

Traceback (most recent call last):
  File "mime_gen_alt.py", line 40, in <module>
    print(msg.as_string())
  File "/home/brandon/python3.2b2/lib/python3.2/email/message.py", line 164, in 
as_string
    g.flatten(self, unixfrom=unixfrom)
  File "/home/brandon/python3.2b2/lib/python3.2/email/generator.py", line 88, 
in flatten
    self._write(msg)
  File "/home/brandon/python3.2b2/lib/python3.2/email/generator.py", line 134, 
in _write
    self._dispatch(msg)
  File "/home/brandon/python3.2b2/lib/python3.2/email/generator.py", line 160, 
in _dispatch
    meth(msg)
  File "/home/brandon/python3.2b2/lib/python3.2/email/generator.py", line 234, 
in _handle_multipart
    self.write('--' + boundary + self._NL)
TypeError: Can't convert 'NoneType' object to str implicitly

----------
components: Library (Lib)
messages: 126187
nosy: brandon-rhodes
priority: normal
severity: normal
status: open
title: Python 3 MIME generator dies if not given boundary
type: crash
versions: Python 3.2

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue10901>
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