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

[Bráulio Bhavamitra]

New comment for Merge Request 299

https://gitlab.com/noosfero/noosfero/merge_requests/299#note_1536139


Bráulio Bhavamitra

can't recover the full error backtrace, but merging this bugfix as it is innofensive

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