post 请求 json 传参是空请求的错误不应该忽略掉, 影响 gin 下参数验证 binding:"required"

[knkp1209]

https://github.com/go-admin-team/go-admin-core/blob/master/sdk/api/api.go 65 行

if err != nil && err.Error() == "EOF" {
	e.Logger.Warn("request body is not present anymore. ")
	err = nil
	continue
}

例如：
当请求结构体定义如下时，客户端请求体不传值时会整个绕过
type Login struct {
User string json:"user" binding:"required"
Password string json:"password" binding:"required"
}