noosfero | Fixes problems when editing a product (!1119)

[Bráulio Bhavamitra]

New comment for Merge Request !1119:

https://gitlab.com/noosfero/noosfero/merge_requests/1119#note_24878871


this is making tests hangs at https://travis-ci.org/noosfero/noosfero/jobs/208340618
please fix or revert


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