Fix: Use 0 for mark-excursion if mark is not defined #6
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When buffer's mark has never been set,
(mark)returnsnil:This in turn causes
(- (mark) (point))to fail with(wrong-type-argument number-or-marker-p nil).mark-excursionis only ever used further down the line if(use-region-p)is true.I'm using emacs-27.0.91. After opening emacs, switching to
*scratch*buffer and tryingsmart-shift-uporsmart-shift-downsaid error occurrs. This PR fixes it.