[GRASS-git] [OSGeo/grass-addons] 9c688a: i.cutlines: use empty input support of i.edge (#461)

[Markus Neteler]

  Branch: refs/heads/master
  Home:   https://github.com/OSGeo/grass-addons
  Commit: 9c688a4f572dc0892216c97ea9c3bc7d8dfde987
      https://github.com/OSGeo/grass-addons/commit/9c688a4f572dc0892216c97ea9c3bc7d8dfde987
  Author: Markus Neteler <neteler at gmail.com>
  Date:   2021-03-01 (Mon, 01 Mar 2021)

  Changed paths:
    M grass7/imagery/i.cutlines/i.cutlines.html
    M grass7/imagery/i.cutlines/i.cutlines.py
    A grass7/imagery/i.cutlines/i_cutlines_canny.png
    M grass7/imagery/i.cutlines/i_cutlines_default.png

  Log Message:
  -----------
  i.cutlines: use empty input support of i.edge (#461)

- make use of new `i.edge -n` flag for empty input/output (#460) to avoid crashes when using tiling
- add Canny example with screenshot