Fix encoding for empty recipient #1276
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The current custom encoding for empty
tofields is erroneous, as it will attempt to end early the RLP processing, leading the final RLP string to miss the length of the final element (thesfield of the signature) in the prefix computation.This can be tested for instance by getting an arbitrary transaction, replace the
tofield withAddressOption(None)encode it, and try to decode it with an online tool like https://toolkit.abdk.consulting/ethereum#rlp.