noosfero | plugins: only call event and default value if needed (#536)

[Bráulio Bhavamitra]

New Merge Request #536

https://gitlab.com/noosfero/noosfero/merge_requests/536

Project:Branches: brauliobo/noosfero:fix-plugins-default-and-hotspots to noosfero/noosfero:master
Author:   Bráulio Bhavamitra
Asignee:  

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