noosfero | noosfero-chat: avoid psql command if postgresql is not installed (#830)

[Rodrigo Souto]

New Merge Request #830

https://gitlab.com/noosfero/noosfero/merge_requests/830

Project:Branches: diguliu/noosfero:noosfero-chat-db-dependency to noosfero/noosfero:master
Author:    Rodrigo Souto
Assignee:  

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