`h` props to behave more like React

Hey @luwes. I have been building something with this library for 2 weeks now and it's been great so far.

But, I notice a bit of unusual pattern when building components using JSX.
Since JSX transpiler always pass `null` if `props` param is empty like:
```jsx
// JSX
Hello

// Transpiled
h(Component, null, "Hello")
```

In Sinuous, you can't destructure `props` like this:
```jsx
const Component = ({ name, intent, as, icon, onDrag, onDrop }) => {
// Do something with props

return (

)
}
```
It throws error simply because `props` is `null`.

So, you need to this instead:
```jsx
const Component = (props) => {
let { name, intent, as, icon, onDrag, onDrop } = props || {}
// Do something with props

return (

)
}
```

In React you can do that, because React internally checks for null `props` and pass `{}` instead.
I plan to build a lot of components and this pattern is slightly annoying. Do you mind if I submit a PR?

Thank you

No source file, test, or entry point is named. Trace how JSX calls h when props are null, then verify that components can destructure props without a fallback and cover the empty-props case; done means the shown JSX pattern no longer throws.

Written by the indexing model from the issue text.