noosfero | Fix crash on article view SQL query (#299)

[Bráulio Bhavamitra]

Merge Request #299 was merged
Merge Request Url: https://gitlab.com/noosfero/noosfero/merge_requests/299
Project:Branches: brauliobo/noosfero:ai3277 to noosfero/noosfero:master
Author: Bráulio Bhavamitra
Assignee: 
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