* Provide the actual `account` for eth_coinbase The previous implementation always provided the `zero address` on `eth_coinbase` RPC. Now, instead the actual address is returned on success or an error when no account(s) is found! * full client `eth_coinbase` return err In the full-client return an error when no account is found instead of returning the `zero address` * Remove needless blocks on single import * Remove needless `static` lifetime on const * Fix `rpc_eth_author` test  | 
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