noosfero | Fix XSS terminate removing custom attributes for Macros (#748)

[Rodrigo Souto]

New comment for Merge Request 748

https://gitlab.com/noosfero/noosfero/merge_requests/748#note_2957104


Rodrigo Souto

We still need to figure out a way of avoiding data-macro-* attributes do be filtered, but I'm merging this since it allows macros without attribute to work properly.

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