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

[Victor Costa]

Merge Request #745 was merged
Merge Request url: 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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