noosfero | Improvements on template mirror blocks behaviour (#763)

[Rodrigo Souto]

New comment for Merge Request 763

https://gitlab.com/noosfero/noosfero/merge_requests/763#note_3272365


Rodrigo Souto

You should replace this by a `after_destroy` because any problem on any observer's destruction may leave blocks mirroring a non-existent block which might have unexpected behaviors.

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