noosfero | Fixes HTML safe problems (!1090)

[Rodrigo Souto]

New comment for Merge Request !1090:

https://gitlab.com/noosfero/noosfero/merge_requests/1090#note_21666163


@gabrielssilva check whether `environment.signup_intro` is `present?` before sending the `html_safe` to solve the broken tests.


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