noosfero | metadata: do not expose metadata on private pages (#639)

[Bráulio Bhavamitra]

New Merge Request #639

https://gitlab.com/noosfero/noosfero/merge_requests/639

Project:Branches: brauliobo/noosfero:metadata-only-for-public-content to noosfero/noosfero:master
Author:    Bráulio Bhavamitra
Assignee:  

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