fix(runtime-core): reset current node when the KeepAlive slots default is null

[linzhe141]

close KeepAlive bug

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB (+7 B)	37.7 kB (+3 B)	33.9 kB (-7 B)
vue.global.prod.js	159 kB (+7 B)	57.5 kB	51.2 kB (-3 B)

Usages

Name	Size	Gzip	Brotli
createApp	55.1 kB	21.2 kB	19.3 kB
createSSRApp	59.1 kB	22.9 kB	20.9 kB
defineCustomElement	59.8 kB	22.7 kB	20.7 kB
overall	68.8 kB (+7 B)	26.3 kB	23.9 kB (-2 B)

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@vue/compiler-core

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@vue/shared

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vue

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@vue/compat

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commit: 93be585

[linzhe141]

duplicate of #11778

[edison1105]

这个改动是不对的。#10632 曾经这么改过一次，引发了#10827。因为问题比较严重，当时回退了 #10632, 如果一定要这么改，需要防止 #10827 再次出问题，但 #10827 的作者已经删除了复现仓库，现在也没办法调查了。我已经联系了 #10827 的作者，希望能找到那个复现。