adding extra checks for unusual failure of get_scheduled_witness
adding extra checks for unusual failure of get_scheduled_witness

abitmore/bitshares-2,bitshares/bitshares-2,peertracksinc/muse,peertracksinc/muse,pmconrad/graphene,cryptonomex/graphene,bigoc/openchain,bitshares/bitshares-2,pmconrad/graphene,pmconrad/graphene,bitsuperlab/cpp-play2,bigoc/openchain,bitshares/bitshares-2,oxarbitrage/bitshares-core,abitmore/bitshares-2,pmconrad/graphene,peertracksinc/muse,bigoc/openchain,cryptonomex/graphene,cryptonomex/graphene,abitmore/bitshares-2,bitsuperlab/cpp-play2,oxarbitrage/bitshares-core,abitmore/bitshares-2,peertracksinc/muse,bitsuperlab/cpp-play2,bitshares/bitshares-2,bigoc/openchain,oxarbitrage/bitshares-core,oxarbitrage/bitshares-core