bug#12351: 24.1; parse-colon-path turns empty paths into nil

[Glenn Morris]

Dave Abrahams wrote:

> It puts nils in exec-path when PATH contains empty elements.

man bash:

  A zero-length (null) directory name in the value of PATH indicates the
  current directory.

C-h v exec-path

  nil [means] (try default directory).


So this all seems totally consistent to me.