[BUG] vue-component-meta does not work correctly when using slots without defined props

[Evertvdw]

Hi there!

I found a bug when using the vue-component-meta package inside Storybook. The autogenerated documentation inside storybook will break when there are slots without explicit props defined.

See https://stackblitz.com/edit/github-admhcw?file=src%2Fstories%2FButton2.vue for a reproduction.

Works:

defineSlots<{
  /**
   * Use for custom content, instead of relying on 'icon' and 'label' props
   */
  default: (props: {}) => VNode[];
  /**
   * Override the default QSpinner when in 'loading' state
   */
  loading: (props: {}) => VNode[];
}>();

Does not work:

defineSlots<{
  /**
   * Use for custom content, instead of relying on 'icon' and 'label' props
   */
  default: () => VNode[];
  /**
   * Override the default QSpinner when in 'loading' state
   */
  loading: () => VNode[];
}>();

Here is the related issue: storybookjs/storybook#26465