Improve Unboxing

[amotl]

Receiving this as a first response, as reported by @gecube, is not very welcoming, I guess?

# grafana-import 
Traceback (most recent call last):
  File "/home/bin/grafana-import", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/home/lib/python3.12/site-packages/grafana_import/cli.py", line 229, in main
    params = grafana_settings(url=args.grafana_url, config=config, label=args.grafana_label)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/lib/python3.12/site-packages/grafana_import/util.py", line 58, in grafana_settings
    params = grafana_settings_from_config_section(config=config, label=label)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/lib/python3.12/site-packages/grafana_import/util.py", line 80, in grafana_settings_from_config_section
    raise ValueError(f"Invalid Grafana configuration label: {label}")
ValueError: Invalid Grafana configuration label: default

Originally posted by @amotl in #17 (comment)

[jozefrewe]

And is there a solution to this error?

[amotl]

Hi. I think you need to invoke grafana-import using relevant options. Without any, it does nothing, but croaks. The latter is only a cosmetic error, but it could still be mitigated to improve guidance for newcomers.