Allow empty label lists in linear map
Allow empty label lists in linear map

BjornFJohansson/giraffe,addgene/giraffe,UndeadBlow/giraffe,BjornFJohansson/giraffe,BjornFJohansson/giraffe,BjornFJohansson/giraffe,addgene/giraffe,addgene/giraffe,BjornFJohansson/giraffe,addgene/giraffe,UndeadBlow/giraffe