Handles Ganache transaction input bug

Why:

* To be able to index transactions, we need to add special handling for
a bug in Ganache in which transaction inputs are returned as invalid
`DATA` types. For details please see:
https://github.com/trufflesuite/ganache/issues/997
* Issue link: https://github.com/poanetwork/blockscout/issues/1068

This change addresses the need by:

* Editing `EthereumJSONRPC.Transaction` to convert incorrectly formatted
transaction `input`s of `0x0` to `0x`.

apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/transaction.ex

@@ -103,8 +103,52 @@ defmodule EthereumJSONRPC.Transaction do
         transaction_index: 0
       }
 
+      Ganache bug: https://github.com/trufflesuite/ganache/issues/997
+      Invalid input of `0x0` is converted to `0x`.
+
+      iex> EthereumJSONRPC.Transaction.elixir_to_params(
+      ...>   %{
+      ...>     "blockHash" => "0x4e3a3754410177e6937ef1f84bba68ea139e8d1a2258c5f85db9f1cd715a1bdd",
+      ...>     "blockNumber" => 46147,
+      ...>     "from" => "0xa1e4380a3b1f749673e270229993ee55f35663b4",
+      ...>     "gas" => 21000,
+      ...>     "gasPrice" => 50000000000000,
+      ...>     "hash" => "0x5c504ed432cb51138bcf09aa5e8a410dd4a1e204ef84bfed1be16dfba1b22060",
+      ...>     "input" => "0x0",
+      ...>     "nonce" => 0,
+      ...>     "r" => 61965845294689009770156372156374760022787886965323743865986648153755601564112,
+      ...>     "s" => 31606574786494953692291101914709926755545765281581808821704454381804773090106,
+      ...>     "to" => "0x5df9b87991262f6ba471f09758cde1c0fc1de734",
+      ...>     "transactionIndex" => 0,
+      ...>     "v" => 28,
+      ...>     "value" => 31337
+      ...>   }
+      ...> )
+      %{
+        block_hash: "0x4e3a3754410177e6937ef1f84bba68ea139e8d1a2258c5f85db9f1cd715a1bdd",
+        block_number: 46147,
+        from_address_hash: "0xa1e4380a3b1f749673e270229993ee55f35663b4",
+        gas: 21000,
+        gas_price: 50000000000000,
+        hash: "0x5c504ed432cb51138bcf09aa5e8a410dd4a1e204ef84bfed1be16dfba1b22060",
+        index: 0,
+        input: "0x",
+        nonce: 0,
+        r: 61965845294689009770156372156374760022787886965323743865986648153755601564112,
+        s: 31606574786494953692291101914709926755545765281581808821704454381804773090106,
+        to_address_hash: "0x5df9b87991262f6ba471f09758cde1c0fc1de734",
+        v: 28,
+        value: 31337,
+        transaction_index: 0
+      }
+
   """
   @spec elixir_to_params(elixir) :: params
+
+  def elixir_to_params(%{"input" => "0x0"} = transaction) do
+    elixir_to_params(%{transaction | "input" => "0x"})
+  end
+
   def elixir_to_params(%{
         "blockHash" => block_hash,
         "blockNumber" => block_number,