[issue19470] email.header.Header - should not allow two newlines in a row

[Vajrasky Kok]

Changes by Vajrasky Kok <sky.kok at speaklikeaking.com>:


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nosy: +r.david.murray, vajrasky

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19470>
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