add empty array test

Author: NullVoxPopuli

test/adapter/json_api/parse_test.rb

@@ -40,6 +40,7 @@ def setup
             }
 
             @illformed_payloads = [nil,
+                                   [],
                                    {},
                                    { 'data' => { 'attributes' => [] } },
                                    { 'data' => { 'relationships' => [] } },