Tweak internal CSS AST implementation #1512
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Right now our CSS AST doesn't differentiate at-rules with an empty body and at-rules that have no body at all.
This is normally not a problem however for CSS mixins
@apply --foo;and@apply --foo {};mean different things — this requires us to be able to differentiate them. We'll be changing this in Tailwind CSS itself at some point so I'm changing this here to be forward compatible with those changes.