noosfero | Fix top_ancestor of root categories (!880)

[Daniela Feitosa]

New Merge Request !880

https://gitlab.com/noosfero/noosfero/merge_requests/880

Project:Branches: danielafeitosa/noosfero:category_ancestor to noosfero/noosfero:master
Author:    Daniela Feitosa
Assignee:  

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