Improve error messages in bts_api_generator
Improve error messages in bts_api_generator

jakeporter/Bitshares,denkhaus/bitsharesx,dacsunlimited/dac_play,bitshares/devshares,denkhaus/bitsharesx,FollowMyVote/bitshares,camponez/bitshares,bitshares/bitshares-0.x,RemitaBit/Remitabit,bitshares/bitshares,RemitaBit/Remitabit,camponez/bitshares,FollowMyVote/bitshares,FollowMyVote/bitshares,bitshares/devshares,jakeporter/Bitshares,bitshares/bitshares,frrp/bitshares,bitsuperlab/cpp-play,bitshares/devshares,drltc/keyid,camponez/bitshares,bitshares/bitshares,FollowMyVote/bitshares,camponez/bitshares,frrp/bitshares,bitshares/devshares,Ziftr/bitshares,dacsunlimited/dac_play,bitshares/bitshares,RemitaBit/Remitabit,drltc/keyid,bitshares/devshares,drltc/keyid,bitshares/devshares,denkhaus/bitsharesx,jakeporter/Bitshares,FollowMyVote/bitshares,dacsunlimited/dac_play,frrp/bitshares,camponez/bitshares,jakeporter/Bitshares,bitsuperlab/cpp-play,bitshares/bitshares,frrp/bitshares,bitsuperlab/cpp-play,bitsuperlab/cpp-play,Ziftr/bitshares,drltc/keyid,Ziftr/bitshares,RemitaBit/Remitabit,dacsunlimited/dac_play,bitshares/bitshares-0.x,bitshares/bitshares-0.x,denkhaus/bitsharesx,frrp/bitshares,bitsuperlab/cpp-play,bitshares/bitshares-0.x,bitshares/bitshares-0.x,RemitaBit/Remitabit,bitshares/bitshares,dacsunlimited/dac_play,FollowMyVote/bitshares,jakeporter/Bitshares,bitsuperlab/cpp-play,jakeporter/Bitshares,camponez/bitshares,frrp/bitshares,bitshares/bitshares-0.x,Ziftr/bitshares,RemitaBit/Remitabit,dacsunlimited/dac_play