Encode zero-length hex-strings with quotes #3754
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When running through the reference tests, I noticed that zero-length hex-strings are encoded without quotation marks. For example, in this test case which has a zero-length extra data field:
https://media.githubusercontent.com/media/ethereum/consensus-spec-tests/master/tests/mainnet/electra/ssz_static/ExecutionPayloadHeader/ssz_random/case_1/value.yaml
In other yaml files, this has quotation marks:
My solution was to wrap the yaml string representer method with a special case for hex-strings.