请大家帮我分析这句， it 前面是不是少了什么成分呀？ that 是做什么从句？谢谢

Question

harry used to consider it a great joke to go into expensive cosmetic shops and make outrageous requests for goods that do not exist

Answer 1

没有少，it a great joke 是consider的宾语，这里的宾语不是一个句子，所以不能有谓语动词was,
如果是一个宾语从句就应该是：Harry used to consider that it was a great joke.
that do not exist这里的that引导的是定语从句，修饰goods, 表示并不存在的货物

Answer 2

it 前面没有少什么成分啊，that是修饰outrageous到goods这部分，是定语从句。