fix(RadioGroup): rendering empty slots (#2456)

test/components/elements/RadioGroup.spec.ts

@@ -0,0 +1,15 @@
+import { describe, it, expect } from 'vitest'
+import type { TypeOf } from 'zod'
+import ComponentRender from '../component-render'
+import { URadioGroup } from '#components'
+
+describe('RadioGroup', () => {
+  it.each([
+    ['basic case', { props: { options: [{ value: 'value', label: 'label' }] } }],
+    ['help text', { props: { options: [{ value: 'value', label: 'label', help: 'i need somebody' }] } }]
+    // @ts-ignore
+  ])('renders %s correctly', async (nameOrHtml: string, options: TypeOf<typeof URadioGroup.props>) => {
+    const html = await ComponentRender(nameOrHtml, options, URadioGroup)
+    expect(html).toMatchSnapshot()
+  })
+})