docs: def _check_cron_env(user,
                      name,
                      value=None):
      '''
      Return the environment changes
      '''
      if value is None:
          value = ""  # Matching value set in salt.modules.cron._render_tab
      lst = __salt__['cron.list_tab'](user)
      for env in lst['env']:
          if name == env['name']:
              if value != env['value']:
                  return 'update'
              return 'present'
      return 'absent'