noosfero | Ai2119 event block plugin (#400)

[Arthur Del Esposte]

New comment for Merge Request 400

https://gitlab.com/noosfero/noosfero/merge_requests/400#note_781681


Arthur Del Esposte

I've been asking myself if this method make any sense. I didn't find any situation where it's possible to have a block without an owner. And if it can exist a block without an owner, it's impossible to get it's enviroment, once it as method of Box object (see its definition). 

What do you think if a I just leave this method as follow?
```ruby
def events_source
  unless all_env_events
    return self.owner
  end

  enviroment
end
```

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