Simplify chain_database_impl::clear_pending as identified by HackFisher in #71
Simplify chain_database_impl::clear_pending as identified by HackFisher in #71

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