usePdf Cannot read properties of null (reading 'props')

Package version: 2.0.20

When using **usePdf** hook, while gendering the PDF an error gets thrown.

Error message:
`TypeError: Cannot read properties of null (reading 'props')`

Stack track leads to:
- react-pdf.browser.es.js
`props = container.document.props || {};`

In the code itself I see define above:
```
var container = {
type: 'ROOT',
document: null
};
```

And accessing props on null can result in such an error.

The result is that for a split of second the **instance.error** returns an error which can be misleading for the user if we check for that property to show an error and after ±half a second the file gets generated and rendered successfully.