Toast sites without pageWrapper result in <undefined> tags

[ChristopherBiscardi]

Toast sites without pageWrapper result in tags

from toast.

[lannonbr]

If you have a simple toast site like such:

.
├── package.json
├── src
│   └── pages
│       └── index.js
├── toast.js
└── yarn.lock

In the generated public/index.html, it will drop in <undefined> in place of the page wrapper.

[lannonbr]

So there's a few issues through this:

1. When SSR is being done, there's not any error handling for the pageWrapper trying to be imported in the incremental command's script. So then when render is being called, it does a h(undefined, data, h(components, ...)) This should be alright to solve by having a default wrapper as is done in the page-renderer code right now.
2. page-renderer-pre.js although is lacking some error handling so if any of the dynamic imports fail, it does not rehydrate clientside. The solution of this likely will have to be some tweaks to the logic in page-renderer-pre.