Amendment: transaction sender might not exists #822
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Currently the Yellow Paper states that transactions from a non-existing sender are invalid. However, historically there've been such transactions with 0 gas price, for example https://etherscan.io/tx/0x0874e15fd07f92bf1143f9abd289c7c0737330782457b9c15d51666021b1194a.
Also, geth does allow such transactions (see preCheck and statedb.go).
This change amends the Yellow Paper to account for such transactions.
Before:
After: