utopian homepage broken because of lost project info in post

so apparently post can somehow loose github project info and then it will crash any view when post is loaded

here https://github.com/utopian-io/utopian.io/blob/master/src/components/Story/Contribution.js#L78

at line 78 there is repository.owner.login but if repository.owner is null it will throw exception

like in this case https://api.utopian.io/api/posts/thecotne/square-file-icons

where repository.owner is null