Better leave `&` as original code when there's no CSS Selector

[nitipit]

Issue

When using & and there's no CSS Selector, the & has been removed in the compiled code. Since nesting CSS & becomes official in early 2023, It would be better not to remove it.

Input

&.red { background-color: red }

Compiled to

.red { background-color: red }

Expect

Input

&.red { background-color: red }

Compiled to

&.red { background-color: red }