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has_many_association: Deal with empty 204 status code
If you register a relationship as a has_many and you this resource
endpoint return a 204 we should handle this gracefully, by returning a
empty array. This patch leverages the default return type defined on the
relationship (@opts[:default]) to construct which sort of response it
would expect (get_collection or a regular get).
The default parser, is dumb and therefore cannot distinguish if when it
receives a 204 it should transform that into a hash or an array, and
always convert the response into a empty hash. So, on the
attributes.rb method called instantiate_collection when we stumble
upon a empty hash we always convert into an empty array.
