Deserialize empty body (missing params in JSON-RPC case) as empty JSON object

[3alpha]

Describe the bug (observed vs expected behavior)

When API endpoint has all optional paramaters, deserialization shouldn't fail when request body is empty.

Not reproducible on testnet

• [x] This issue is only present on Devnet and cannot be reproduced on the alpha-sepolia testnet (check the box if true).

To Reproduce Steps to reproduce the behavior:

This fails: curl -X POST http://127.0.0.1:5050/dump It shouldn't fail, and it should behave identicaly as: curl -X POST http://127.0.0.1:5050/dump -d '{}'

In JSON-RPC case, this fails:

{
  "method": "devnet_dump",
  "id": "1",
  "jsonrpc": "2.0"
}

And this doesn't:

{
  "method": "devnet_dump",
  "id": "1",
  "jsonrpc": "2.0",
  "params": {}
}

As before, both cases should behave identically. Devnet version

• I am using Devnet version: latest