fixup! fix setting root element and don't return empty values

Author: olafura

lib/microsoft_kiota_serialization_json/json_serialization_writer.rb

@@ -152,17 +152,17 @@ def write_collection_of_object_values(key, values)
           end
         end
         @writer[key] = values.map do |v|
-          self.write_object_value(nil, v).writer
+          self.write_object_value(nil, v, true).writer
         end
       end
     end
 
-    def write_object_value(key, value)
+    def write_object_value(key, value, array = false)
       if value
         if !key
           temp = JsonSerializationWriter.new()
           value.serialize(temp)
-          @writer = temp.writer
+          @writer = @writer.merge(temp.writer) unless array
           return temp
         end
         begin