noosfero | Merge branch 'chat-notification' into 'master' (!1034)

[Rodrigo Souto]

New Merge Request !1034

https://gitlab.com/noosfero/noosfero/merge_requests/1034

Branches: cherry-pick-3757c1d9 to stable-1.6
Author:    Rodrigo Souto
Assignee:  Rodrigo Souto

chat: avoid notification crash on browsers that does not support it

See merge request !1031

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