Gorm Noticed a bug with embedded structs not being nil

GORM Playground Link

https://github.com/go-gorm/playground/pull/714

Description

When adding a new type Address string and using that in an embedded struct, the embedded struct is not nil anymore when everything is empty.

I would love to contribute code to fix it but I find it a bit difficult to figure out all the reflection code 😅

I also wrote the same code here: https://github.com/stijndehaes/gorm/blob/bug/embedded-issue/tests/embedded_struct_test.go#L101

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