Fix options fallback and CSS formatting behavior

[Sec-ant]

• Empty list of tags and comments shouldn't fallback to identifiers.
• Make embedded css formatting more align with the built-in behavior.

Fixes #88.

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Latest commit: 7f23e8ad5991e10ee64f5dc6bcc790b1f4b62672

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| Name | Type | | --------------------- | ----- | | prettier-plugin-embed | Patch |

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