Fix Issue 11830 - ByLine range length incorrect.

If you don't call `front` on a `ByLine` range then an extra line is reported. This change ensures the extra line is consumed when only calling `empty` without `front`.

https://d.puremagic.com/issues/show_bug.cgi?id=11830
Remove first line laziness from ByLineImpl.
Merge pull request #1883 from Poita/bug11830

Fix Issue 11830 - ByLine range length incorrect.