framework: fix python channel_list return value bug
framework: fix python channel_list return value bug

wanglei828/apollo,ycool/apollo,wanglei828/apollo,ApolloAuto/apollo,xiaoxq/apollo,xiaoxq/apollo,jinghaomiao/apollo,wanglei828/apollo,xiaoxq/apollo,wanglei828/apollo,ycool/apollo,ApolloAuto/apollo,xiaoxq/apollo,jinghaomiao/apollo,wanglei828/apollo,xiaoxq/apollo,xiaoxq/apollo,ApolloAuto/apollo,jinghaomiao/apollo,wanglei828/apollo,ApolloAuto/apollo,ApolloAuto/apollo,ApolloAuto/apollo,ycool/apollo,jinghaomiao/apollo,jinghaomiao/apollo,jinghaomiao/apollo,ycool/apollo,ycool/apollo,ycool/apollo