fix: replacing projection content with null or undefined

[Varixo]

Before we ignored children if they were equal to null or undefined. We should only ignore them if we don't have old projection slots and the children are null

closes #7147

[changeset-bot]

🦋 Changeset detected

Latest commit: 9e4bf8f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
@qwik.dev/core	Patch
eslint-plugin-qwik	Patch
@qwik.dev/react	Patch
@qwik.dev/router	Patch
create-qwik	Patch

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npm i https://pkg.pr.new/QwikDev/qwik/@qwik.dev/core@7148

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npm i https://pkg.pr.new/QwikDev/qwik/eslint-plugin-qwik@7148

npm i https://pkg.pr.new/QwikDev/qwik/create-qwik@7148

commit: 9e4bf8f

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[shairez]

Thanks @Varixo ! 🙏