bugfix in api causing runtime error in python 3
bugfix in api causing runtime error in python 3

claesenm/optunity,chrinide/optunity,chrinide/optunity,MarkAWard/optunity,claesenm/optunity,chrinide/optunity,claesenm/optunity,claesenm/optunity,MarkAWard/optunity,MarkAWard/optunity,MarkAWard/optunity,chrinide/optunity