[issue11558] Raise a more helpful exception in email.message.Message.attach after set_payload("some string")

[R. David Murray]

R. David Murray added the comment:

Committed, thanks Varun.

Note that I made two changes to your patch: added a missing space in the folded message (your second PEP8 change), and I renamed the test method to make it clearer what was being tested.

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stage:  -> committed/rejected
status: open -> closed
type:  -> enhancement
versions: +Python 3.4, Python 3.5

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