make empty string fallback for missing git remote #54
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Hi,
see jekyll/jekyll#4748 for more information about the issue.
Before
![bildschirmfoto 2016-04-05 um 21 05 23](https://cloud.githubusercontent.com/assets/570608/14294589/305b827e-fb72-11e5-920e-7ca2e402f52f.png)
After
![bildschirmfoto 2016-04-05 um 21 05 36](https://cloud.githubusercontent.com/assets/570608/14294598/3aaaf642-fb72-11e5-8126-3abc1a1b1277.png)