noosfero | require_auth_to_comment: fix exception on context not defined (#550)

[Bráulio Bhavamitra]

Merge Request #550 was closed by Bráulio Bhavamitra
Merge Request url: https://gitlab.com/noosfero/noosfero/merge_requests/550
Project:Branches: brauliobo/noosfero:fix-crash-on-require_auth_to_comment to noosfero/noosfero:master
Author: Bráulio Bhavamitra
Assignee: 
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