Empty file route should not generate layout

[A-kirami]

Describe

When using nested routes, empty file route generate layouts.

const routes = [
  {
    path: '/users',
    component: {
	    "default": "src/layouts/default.vue"
	},
    children: [
      { path: '', component: () => import('src/pages/users/index.vue') },
    ],
  },
]

Reproduction

The page directory structure is as follows.

src/pages/
└── users/
    └── index.vue

Expected behavior

const routes = [
  {
    path: '/users',
    // there should be no layout components here
    children: [
      { path: '', component: () => import('src/pages/users/index.vue') },
    ],
  },
]

[zcqno1]

much like #144