Generic path with empty "" root and no names is failing to return empty path when element 0 is requested

According to (the test for UnixPath)[http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/tip/test/java/nio/file/Path/PathOps.java] line 800, when you request a path with a empty string for a root and zero names and you then request the element 0, it should return a path with an empty root and zero names.
