Empty Call response should return 0x instead of 0x00. Closes #739 #786
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Parent returns a hexstring converted with common.FromHex(), which does not adhere to hexdata spec for empty result. This is a hack to handle this specific case.
A better fix would be to alter XEth to return the bytes instead of a hexified string or to make hexdata a proper type and return that. Currently, it only exists in RPC package.