fix(keepalive): render fails when cache contains undefined

[kakkokari-gtyih]

What

I cherry-picked changes on #11431 and added test for this issue on top of the existing test case by adding extra conditions.
(Should I add test case separately for this?)

Fix #11427
Close #11431

[netlify]

❌ Deploy Preview for vue-next-template-explorer failed.

Name	Link
🔨 Latest commit	f8ef733
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[kakkokari-gtyih]

#11496 (comment) seems nothing to do with the content of the PR

[kakkokari-gtyih]

Netlify keeps failing... Are there other PRs affected?

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	90.1 kB (+4 B)	34.6 kB (+2 B)	31.1 kB (+4 B)
vue.global.prod.js	147 kB (+4 B)	54 kB (+2 B)	48 kB (-23 B)

Usages

Name	Size	Gzip	Brotli
createApp	49.6 kB	19.5 kB	17.8 kB
createSSRApp	53.2 kB	21 kB	19.1 kB
defineCustomElement	51.9 kB	20.2 kB	18.5 kB
overall	63.1 kB (+4 B)	24.5 kB (+3 B)	22.3 kB (-30 B)