Include empty has_many/has_and_belongs_to_many associations as empty array...
Include empty has_many/has_and_belongs_to_many associations as empty array tags when serializing to XML git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7169 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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