fix: set default render when template is empty #1745
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@vue/compiler-sfcwill returnnullif<template>is empty, so we need default render to handle it.https://github.com/vuejs/vue-next/blob/f4621ff5ee4abe924d985177956af3ddc9bb378f/packages/compiler-sfc/__tests__/parse.spec.ts#L114-L119
Also, this is also handled by
rollup-plugin-vue:https://github.com/vuejs/rollup-plugin-vue/blob/6960203fdc4285b4322a2c4f061f4a2773d49c9c/src/index.ts#L469
Without this default render, it would cause "Component is missing template or render function" warning