None arglist gives AttributeError, should give ConfigValidationError

[eivindjahren]

The following condition can apparently happening, although we don't have a way of reproducing it yet:

ERT crashed unexpectedly with "'NoneType' object has no attribute 'append'"
Traceback (most recent call last):
File ".../ert/__main__.py", line 599, in main
args.func(args, context.plugin_manager)
File ".../ert/__main__.py", line 199, in run_gui_wrapper
run_gui(args, ert_plugin_manager)
File ".../ert/gui/main.py", line 52, in run_gui
window, ens_path, ensemble_size, parameter_config = _start_initial_gui_window(
File ".../ert/gui/main.py", line 128, in _start_initial_gui_window
ert_config = ErtConfig.from_file(args.config)
File ".../ert/_c_wrappers/enkf/ert_config.py", line 96, in from_file
user_config_dict = ErtConfig.read_user_config(
File ".../ert/_c_wrappers/enkf/ert_config.py", line 295, in read_user_config
return lark_parse(
File ".../ert/parsing/lark_parser.py", line 535, in parse
config_dict = _tree_to_dict(
File "...ert/parsing/lark_parser.py", line 224, in _tree_to_dict
arglist.append(value_list)
AttributeError: 'NoneType' object has no attribute 'append'

[oysteoh]

Think this duplicates #5711 and should have been patched in 2023.06.04