Return early in the case of an empty path
Return early in the case of an empty path

This reduces the indentation of the rest of the code and gets that
case out of the way.

mysociety/pombola,ken-muturi/pombola,hzj123/56th,ken-muturi/pombola,geoffkilpin/pombola,patricmutwiri/pombola,ken-muturi/pombola,mysociety/pombola,geoffkilpin/pombola,ken-muturi/pombola,geoffkilpin/pombola,patricmutwiri/pombola,patricmutwiri/pombola,geoffkilpin/pombola,ken-muturi/pombola,patricmutwiri/pombola,mysociety/pombola,patricmutwiri/pombola,hzj123/56th,geoffkilpin/pombola,hzj123/56th,hzj123/56th,mysociety/pombola,hzj123/56th,patricmutwiri/pombola,ken-muturi/pombola,hzj123/56th,geoffkilpin/pombola,mysociety/pombola,mysociety/pombola