[issue21079] EmailMessage.is_attachment == False if filename is present

[Brandon Rhodes]

Brandon Rhodes added the comment:

Oh - this also, happily, explains why iter_attachments() is ignoring
all of the attachments on my email: because it internally relies upon
is_attachment to make the decision. So this fix will also make
iter_attachments() usable!

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21079>
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