Enable EthClient to call the receive function of a contract

[gabrielbosio]

According to https://docs.soliditylang.org/en/v0.8.13/contracts.html?highlight=receive#receive-ether-function

The receive function is executed on a call to the contract with empty calldata.

Right now, the invoke function breaks when is called with a method as an empty string. The idea is that, in that case, the client sends a transaction with empty calldata.