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

[Bráulio Bhavamitra]

New Merge Request #550

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
Asignee:  

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