#92 -- Fix .git removing

src/main/java/ru/ulstu/extractor/gitrepository/model/GitRepository.java

@@ -31,6 +31,8 @@ public class GitRepository extends BaseEntity {
     }
 
     private String removeDotGit(String prevName) {
-        return prevName.substring(0, prevName.lastIndexOf(".git"));
+        return prevName.lastIndexOf(".git") > 0
+                ? prevName.substring(0, prevName.lastIndexOf(".git"))
+                : prevName;
     }
 }