toBlob() crashes when undefined is provided to <Text>'s render prop

[vinibanaco]

Describe the bug
When using the Text component without providing a render prop it works as intended, as it does when providing a function. However, if provided with undefined it crashes when creating the blob ( pdf(doc).toBlob()). It throws a TypeError: node.props.render is not a function.

To Reproduce
This works:

const doc = (
  <Document>
    <Page>
      <Text>Something</Text>
    </Page>
  </Document>
);
const blob = await pdf(doc).toBlob();

This doesn't:

const doc = (
  <Document>
    <Page>
      <Text render={undefined}>Something</Text>
    </Page>
  </Document>
);
const blob = await pdf(doc).toBlob();

Expected behavior
Even though it's probably not a common issue, it's useful to accept undefined if a variable that can be either a function or undefined is provided.

Desktop (please complete the following information):

• OS: Linux Mint
• Browser: Chrome
• React-pdf version 4.3.0