storage: ignore OP_RETURN scripts explicitly so they don't log an "Unknown script type" message
storage: ignore OP_RETURN scripts explicitly so they don't log an "Unknown script type" message

mhanne/bitcoin-ruby,assafshomer/bitcoin-ruby,robertg/bitcoin-ruby,georgemillo/bitcoin-ruby,tarix/bitcoin-ruby,bitpesa/bitcoin-ruby,Zlerp/bitcoin-ruby,xiumiao/bitcoin-ruby