noosfero | require_auth_to_comment_plugin: fix exception protected method calling logged_in? (#745)

[Leandro Nunes]

New Merge Request #745

https://gitlab.com/noosfero/noosfero/merge_requests/745

Project:Branches: participa/noosfero:require_auth_to_comment_fix to noosfero/noosfero:master
Author:    Leandro Nunes
Assignee:  

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