noosfero | Fix saving unsubscribers list (!1076)

[Victor Costa]

Merge Request !1076 was merged
Merge Request url: https://gitlab.com/noosfero/noosfero/merge_requests/1076
Project:Branches: noosferogov/noosfero:fix_unsubscribe_newsletter to noosfero/noosfero:master
Author: Evandro Jr
Assignee: 
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