[GRASS-git] [OSGeo/grass] 960133: scripts/i.spectral: show error message if one of t...

[Tomas Zigo]

  Branch: refs/heads/releasebranch_7_8
  Home:   https://github.com/OSGeo/grass
  Commit: 960133e8f674ca36f6587a16646d69ce3f864997
      https://github.com/OSGeo/grass/commit/960133e8f674ca36f6587a16646d69ce3f864997
  Author: Tomas Zigo <50632337+tmszi at users.noreply.github.com>
  Date:   2021-12-02 (Thu, 02 Dec 2021)

  Changed paths:
    M scripts/i.spectral/i.spectral.html
    M scripts/i.spectral/i.spectral.py

  Log Message:
  -----------
  scripts/i.spectral: show error message if one of the supported monitor isn't running (#1991)

* scripts/i.spectral: show error message if one of the supported monitor isn't running

By default, d.linegraph is used internally to create a graph image
which requires the launch of one of the supported monitor (cairo, png, ps).

Co-authored-by: Markus Neteler <neteler at osgeo.org>