<path>{children}</path> not rendered, crashes w/ error

# problem

i copied and pasted [some of these](https://codepen.io/aurer/pen/jEGbA) into my choo app, only to find `bel` wasn't too happy about the DOM structure.

`scripts:browserify.bundle multiple root elements must be wrapped in an enclosing tag`

doesn't work:
```js

```

does work, but non-equivalent:
```js

```

related: https://github.com/choojs/choo/issues/514

Start by reproducing the two SVG examples from the issue in nanohtml and trace the bel parsing path that reports multiple root elements. Compare the nested case with the self-closing case; done means the nested SVG structure renders without the reported crash and existing behavior remains intact.

Written by the indexing model from the issue text.