[Bug]: No files found from the passed PurgeCSS option 'content'.

[diegohaz]

Describe the bug

On v6.0.0-alpha.0, when passing raw content, there's a warning saying no files were found:

No files found from the passed PurgeCSS option 'content'.

I understand this makes sense when passing file names, but not when using raw.

To Reproduce

1. Open https://stackblitz.com/edit/node-rc7yl6?file=index.js
2. Run node index.js in the terminal

Expected Behavior

No warning

Environment

OS: macOS, Package: purgecss, Version: v6.0.0-alpha.0

Add any other context about the problem here

No response

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