throw error if there is no string representation
throw error if there is no string representation

reddit/fullnode,iobond/bitcore,maraoz/coinforge,UdjinM6/bitcore-dash,williamcotton/bitcore,bilthon/bitcore,bankonme/bitcore,iobond/bitcore,ryanxcharles/fullnode,williamcotton/bitcore,GroestlCoin/groestlcore,bitpay/bitcore,bitpay/bitcore,daxxog/clamcore,martindale/fullnode,janko33bd/bitcore,initaldk/bitcore,eordano/bitcore,MonetaryUnit/bitcore,pnagurny/bitcore,ryanxcharles/fullnode,olalonde/bitcore,bitjson/bitcore,genecyber/bitcore,TOMOAKI12345/bitcore,janko33bd/bitcore,olalonde/bitcore,TOMOAKI12345/bitcore,martindale/bitcore,initaldk/bitcore,lekkas/bitcore,bilthon/bitcore,TeamPiggyCoin/PiggyCore,litecoin-project/litecore,maraoz/coinforge,adjoinant/bitcore,eXcomm/bitcore,bitjson/bitcore,bankonme/bitcore,lekkas/bitcore,pnagurny/bitcore,phplaboratory/bitcore,jcvernaleo/bitcore,martindale/fullnode,braydonf/bitcore,iobond/bitcore,genecyber/bitcore,MonetaryUnit/bitcore,bitpay/bitcore,eXcomm/bitcore,adjoinant/bitcore,braydonf/bitcore,iobond/bitcore,phplaboratory/bitcore,martindale/bitcore,litecoin-project/litecore,bitjson/bitcore,eordano/bitcore,bitjson/bitcore,martindale/bitcore,bitpay/bitcore,jcvernaleo/bitcore,iobond/bitcore,martindale/bitcore,daxxog/clamcore,TeamPiggyCoin/PiggyCore