#3 add None to oaipmh.common.Header and oaipmh.common.Metadata#4

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akorosov wants to merge 1 commit intoinfrae:masterfrom nansencenter:master

+20-19

Commits on Apr 22, 2016

infrae#3 add None to oaipmh.common.Header and oaipmh.common.Metadata
akorosov
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