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

[Bráulio Bhavamitra]

New comment for Merge Request 550

https://gitlab.com/noosfero/noosfero/merge_requests/550#note_1104485


Bráulio Bhavamitra

@terceiro on cirandas it happened in some specific profiles, can't really know why

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