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_1099654


Bráulio Bhavamitra

error:

```
  undefined local variable or method `context' for #<#<Class:0x101f9374>:0x101f87e4>

  app/helpers/profile_helper.rb:189:in `method_missing'
  config/plugins/require_auth_to_comment/views/profile-editor-extras.html.erb:3:in `_config_plugins_require_auth_to_comment_views_profile_editor_extras_html_erb___503158149_122945430'
```

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