fix undo_state_test, your chain could be longer than my chain
fix undo_state_test, your chain could be longer than my chain

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