rpc: Account parser treats any allocated system account as uninitialized nonce

[jstarry]

Problem

When requesting parsed account info for an allocated system account, the RPC response always indicates that the account is an uninitialized nonce regardless of size as long as allocated data is greater than zero

curl http://devnet.solana.com -X POST -H "Content-Type: application/json" -d '  
  {"jsonrpc":"2.0", "id":1, "method":"getAccountInfo", "params":["56UXxC5viVZqHRsqVb1jCpmZ2aX2TcgDuj7CgDt8Rhz8", {"encoding": "jsonParsed"}]}
' | jq .            
{
  "jsonrpc": "2.0",
  "result": {
    "context": {
      "slot": 49887288
    },
    "value": {
      "data": {
        "parsed": {
          "type": "uninitialized"
        },
        "program": "nonce",
        "space": 93
      },
      "executable": false,
      "lamports": 1538160,
      "owner": "11111111111111111111111111111111",
      "rentEpoch": 115
    }
  },
  "id": 1
}

Proposed Solution

Only parse initialized nonce accounts, treat all other allocated accounts as un-parseable system accounts

tag @CriesofCarrots

[jstarry]

Thanks for jumping on this @CriesofCarrots!