Throw MissingLedgerHistoryError in getTransaction only when ledgers are missing prior to the last closed ledger.
Throw MissingLedgerHistoryError in getTransaction only when ledgers are missing prior to the last closed ledger.

darkdarkdragon/ripple-lib,wilsonianb/ripple-lib,darkdarkdragon/ripple-lib,wilsonianb/ripple-lib,darkdarkdragon/ripple-lib,ripple/ripple-lib,wilsonianb/ripple-lib,ripple/ripple-lib,ripple/ripple-lib,ripple/ripple-lib