noosfero | chat: avoid notification crash on browsers that does not support it (!1031)

[Rodrigo Souto]

Merge Request !1031 was merged
Merge Request url: https://gitlab.com/noosfero/noosfero/merge_requests/1031
Project:Branches: diguliu/noosfero:chat-notification to noosfero/noosfero:master
Author: Rodrigo Souto
Assignee: 
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