noosfero | Fix saving unsubscribers list (!1076)

[Evandro Jr]

New Merge Request !1076

https://gitlab.com/noosfero/noosfero/merge_requests/1076

Project:Branches: noosferogov/noosfero:fix_unsubscribe_newsletter to noosfero/noosfero:master
Author:    Evandro Jr
Assignee:  

The list of unsubscribers were not being saved.

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