Removes `$undefined` strings from being sent through the network when
sending form state requests. When adding new array rows, we assign
`blockType: undefined` which is stringified to `"$undefined"`. This is
unnecessary, as simply not sending this property is equivalent, and this
is only a requirement for blocks. This change will save on request size,
albeit minimal.
| Before | After |
|--|--|
|<img width="1267" alt="Untitled"
src="https://github.com/user-attachments/assets/699f38bd-7db9-4a52-931d-084b8af8530f"
/> | <img width="1285" alt="image"
src="https://github.com/user-attachments/assets/986ecd4c-f22d-4143-ad38-0c5f52439c67"
/> |
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