noosfero | Fix product categories listing problem (!1055)

[Karine]

New Merge Request !1055

https://gitlab.com/noosfero/noosfero/merge_requests/1055

Project:Branches: noosfero-mes/noosfero:products_category_problem to noosfero/noosfero:master
Author:    Karine
Assignee:  

Product categories are been listing correct now.

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