fix(runtime-vapor): render slot fallback if provided content is invalid

[edison1105]

close #13668

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[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
compiler-dom.global.prod.js	84 kB	29.8 kB	26.3 kB
runtime-dom.global.prod.js	104 kB	39.1 kB	35.3 kB
vue.global.prod.js	162 kB	59.3 kB	52.8 kB

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	47.2 kB	18.4 kB	16.9 kB
createApp	56 kB	21.6 kB	19.7 kB
createApp + vaporInteropPlugin	69.1 kB (+458 B)	26 kB (+122 B)	23.7 kB (+117 B)
createVaporApp	21.3 kB (+456 B)	8.39 kB (+130 B)	7.7 kB (+125 B)
createSSRApp	60.3 kB	23.3 kB	21.3 kB
defineCustomElement	61 kB	23.1 kB	21.1 kB
overall	70.5 kB	26.8 kB	24.5 kB

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commit: 046add8

[alex-snezhko]

LGTM!

[LittleSound]

Playground

The current implementation cannot support the above situation.
recommended to add a non-rendering related state to Fragment. Implement this feature by maintaining that state.

[edison1105]

Playground

The current implementation cannot support the above situation. recommended to add a non-rendering related state to Fragment. Implement this feature by maintaining that state.

fixed in #13408 see d7a7672

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