noosfero | using a better semantic to test false results (#641)

[Bráulio Bhavamitra]

Merge Request #641 was merged
Merge Request Url: https://gitlab.com/noosfero/noosfero/merge_requests/641
Project:Branches: joenio/noosfero:refute-insteadof-assert-not to noosfero/noosfero:master
Author: Joenio Costa
Assignee: 
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