dillon1000/react

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[Flight] Add support for returning `undefined` from render (#26349)

## Summary

Adds support for returning `undefined` from Server Components.
Also fixes a bug where rendering an empty fragment would throw the same
error as returning undefined.

## How did you test this change?

- [x] test failed with same error message I got when returning undefined
from Server Components in a Next.js app
- [x] test passes after adding encoding for `undefined`
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M packages/react-client/src/ReactFlightClient.js ModifiedM packages/react-client/src/__tests__/ReactFlight-test.js ModifiedM packages/react-server/src/ReactFlightServer.js Modified
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