fix(net/ghttp): nil pointer panic error when server logger set nil

[gqcn]

fix #4047

[houseme]

是不是搞个默认兜底的呢？这样处理就必须要设置了

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Is there a way to keep everything in check by default? In this way, it is necessary to set up

[gqcn]

是不是搞个默认兜底的呢？这样处理就必须要设置了

是允许将Logger设置为nil的，表示不打印日志，但是会引起一些内部的问题，因为内部逻辑没处理好，这里就做了一些判断改进。

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Is there a way to keep everything secret by default? In this way, it is necessary to set up

It is allowed to set Logger to nil, which means no logs will be printed, but it will cause some internal problems because the internal logic is not handled well, so some judgment improvements have been made here.