fix: handle nullish dynamic event name with event modifiers

[linzhe141]

close #13056

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	101 kB (+73 B)	38.1 kB (+24 B)	34.4 kB (+42 B)
vue.global.prod.js	159 kB (+140 B)	58 kB (+44 B)	51.6 kB (+50 B)

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	46.5 kB	18.2 kB	16.7 kB
createApp	54.5 kB	21.3 kB	19.5 kB
createSSRApp	58.7 kB	23 kB	21 kB
defineCustomElement	59.4 kB	22.9 kB	20.8 kB
overall	68.6 kB	26.4 kB	24 kB

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commit: d2d2e3d

[jh-leong]

/ecosystem-ci run

[vue-bot]

📝 Ran ecosystem CI: Open

suite	result	latest scheduled
quasar	✅ success	✅ success
language-tools	✅ success	✅ success
primevue	✅ success	✅ success
pinia	✅ success	✅ success
radix-vue	✅ success	✅ success
router	✅ success	✅ success
nuxt	❌ failure	✅ success
vant	✅ success	✅ success
vite-plugin-vue	✅ success	✅ success
vuetify	✅ success	✅ success
vueuse	✅ success	✅ success
vitepress	✅ success	✅ success
vue-macros	✅ success	✅ success
vue-i18n	✅ success	✅ success
vue-simple-compiler	✅ success	✅ success
test-utils	✅ success	✅ success