如果JsonInjector.get函数的输入值为null零, 则更改错误消息。 #1613
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如果
JsonInjector.get函数中refer的值为null,则会导致NPE发生在变量更改之后。这使得查看错误消息并确认错误是否由
refer的值引起变得困难。本次 PR 修改为在变量更改之前直接触发错误,以便返回更有利于进一步调试的信息。