Some methods return invalid JSON RPC 2.0 errors

[tshakalekholoane]

The following error message is shown to the user sometimes which is is not valid according to the JSON RPC 2.0 specification.

{
  "jsonrpc": "2.0",
  "error": {},
  "id": 1
}

• getBlockWithTxHashes and getBlockWithTxs.
  • When -1 is passed in as a parameter.
  • When a valid block is queried but one that is not yet synced.
• getStorageAt.
  • When no arguments are passed in.
• getTransactionByBlockAndIndex.
  • When the following parameters are passed in [-1, 0].
  • When the field elements are not padded with enough zeroes according to the following regular expression ^0x0[a-fA-F0-9]{1,63}$.
• getBlockTransactionCount.
  • For the following arguments [-1] and a valid but block that does not exist e.g. [99999].