Merge branch 'bugfix/missing_config_error' into 'master'

fix exception when printing error message about missing config

See merge request !2

netdb_client/util.py

@@ -54,7 +54,7 @@ class ArgumentParser(argparse.ArgumentParser):
                     if getattr(args, option) is None:
                         self.error(
                             f'No {option} specified (looked in args, environment variable '
-                            f'"NETDB_{option.upper()}", config-file in "{args.config}")'
+                            f'"NETDB_{option.upper()}", config-file in "{args.auth_config}")'
                         )
 
         # load base_url first!