Fix inertia-link crashing when self-closing

[m1guelpf]

This PR fixes an error triggered when you create self-closing inertia-link component, which sets slots to null:

<inertia-link class="absolute inset-0 z-10" :href="route('dashboard.edit', dashboard).url()" />

[claudiodekker]

Use-case: You have a list of blog posts, with a title, summary & "read more" link, but want the entire blog post to be clickable and behave like the "read more" link while still keeping links that are part of the summary functional.

Because HTML can't have nested links, there's two solutions to this problem:

1. Make the parent div clickable instead of wrapping it in a link (vue: <div @click="readMoreAction" ...)
2. Create an empty link that you overlay on top of the whole blog post summary (z-index), and make the links inside the summary an even higher z-index so they end up on top of the overlay.

This PR aims to solve the 2nd approach.

[dillingham]

@claudiodekker ran into this when copying the pingcrm paginator into a jetstream project

<inertia-link v-else :key="key" class="mr-1 mb-1 px-4 py-3 text-sm leading-4 border rounded hover:bg-white focus:border-indigo-500 focus:text-indigo-500" :class="{ 'bg-white': link.active }" :href="link.url" v-html="link.label" />

Notably, the v-html at the end / absence of default slot.

Uncaught (in promise) TypeError: i.default is not a function

[reinink]

Awesome, thanks for fixing this! 🙌