noosfero | Some API methods unlocked for visitor (#840)

[Leandro Nunes]

New comment for Merge Request 840

https://gitlab.com/noosfero/noosfero/merge_requests/840#note_4633930


Leandro Nunes

this is not part of this feature (unlock api for visitor)
put this code in other commit 
refactor to something like this:

person_id = person.nil? ? nil : person.id

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