Fix CI errors caused by cancun EVM (#103)

* Handle execution errors with empty data

* Switch tests to use shanghai as a temporary fix

Since ganache-cli is deprecated and will not support newer evm versions,
as a temporary fix we can switch back to shanghai.

This won't affect any runtime features.

lib/ethers.ex

@@ -680,6 +680,9 @@ defmodule Ethers do
   defp post_process({:ok, result}, _tx_data, _action),
     do: {:ok, result}
 
+  defp post_process({:error, %{"data" => "0x"} = full_error}, _tx_data, _action),
+    do: {:error, full_error}
+
   defp post_process(
          {:error, %{"data" => "0x" <> error_data} = full_error},
          %{base_module: module},

test/test_prepare.exs

@@ -9,7 +9,7 @@ for file <- File.ls!(test_contracts_path) do
       "/bin/bash",
       [
         "-c",
-        "solc #{Path.join(test_contracts_path, name)}.sol --combined-json abi,bin | jq \".contracts | to_entries | .[0].value\" > tmp/#{name}_abi.json"
+        "solc #{Path.join(test_contracts_path, name)}.sol --evm-version=shanghai --combined-json abi,bin | jq \".contracts | to_entries | .[0].value\" > tmp/#{name}_abi.json"
       ]
     )
 end