[GRASS-git] [OSGeo/grass-addons] 75f174: i.sentinel.mask: test if metadata_file esists

[Markus Neteler]

  Branch: refs/heads/master
  Home:   https://github.com/OSGeo/grass-addons
  Commit: 75f174cca21eacbc6e83178650f20c65fc6e67b3
      https://github.com/OSGeo/grass-addons/commit/75f174cca21eacbc6e83178650f20c65fc6e67b3
  Author: Markus Neteler <neteler at gmail.com>
  Date:   2020-06-18 (Thu, 18 Jun 2020)

  Changed paths:
    M grass7/imagery/i.sentinel/i.sentinel.mask/i.sentinel.mask.py

  Log Message:
  -----------
  i.sentinel.mask: test if metadata_file esists

- fail better if file hasn't been properly specified by the user