"default_tasks" config option not passed to `forget` except through `DOIT_CONFIG`

[cr1901]

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Describe the bug

Consider the following python script that imports doit:

#!/usr/bin/env python3

import sys

from doit.cmd_base import ModuleTaskLoader
from doit.doit_cmd import DoitMain
from pathlib import Path

# DOIT_CONFIG = {
#     "action_string_formatting": "new",
#     "verbosity": 2,
#     "default_tasks": ["init_dataset"],
# }

def task_init_dataset():
    return {
        "actions": []
    }

def main():
    sys.exit(DoitMain(ModuleTaskLoader(globals()), extra_config={
        "GLOBAL": {
            "action_string_formatting": "new",
            "verbosity": 2,
            "default_tasks": ["init_dataset"],
            # "forget_all": True
        }
    }).run(sys.argv[1:]))

if __name__ == "__main__":
    main()

If, for example, I name the above script min.py, do chmod 755 min.py, and then run ./min.py forget, I get divergent behavior when DOIT_CONFIG is commented out or not. If DOIT_CONFIG is commented out, I get:

william@xubuntu-dtrain:~/Projects/life-hacks/crzsnap$ ./min.py forget
Traceback (most recent call last):
  File "/home/william/.local/lib/python3.10/site-packages/doit/doit_cmd.py", line 294, in run
    return command.parse_execute(args)
  File "/home/william/.local/lib/python3.10/site-packages/doit/cmd_base.py", line 150, in parse_execute
    return self.execute(params, args)
  File "/home/william/.local/lib/python3.10/site-packages/doit/cmd_base.py", line 570, in execute
    return self._execute(**exec_params)
  File "/home/william/.local/lib/python3.10/site-packages/doit/cmd_forget.py", line 62, in _execute
    for name in forget_list:
TypeError: 'NoneType' object is not iterable

If I do not have DOIT_CONFIG commented, I get a successful run:

william@xubuntu-dtrain:~/Projects/life-hacks/crzsnap$ ./min.py forget
forgetting init_dataset

Is this intentional or a bug? I'm guessing it is a bug, but am unsure.

Additional Context

This is mostly for future-me when he inevitably forgets.

For the purpose of finalizing a Command to execute, all config sources (including DOIT_CONFIG, config INI/TOML files, and command-line params) are collected into the params argument. The default tasks to execute are retrieved from params.

Config values parsed from an INI/TOML file only override command-line arguments if the Command subclass indicates that it supports the option via its cmd_options attribute or similar. The forget command does not support default_tasks as a command-line argument. OTOH, config loaded from DOIT_CONFIG bypasses the command-line/config file arg checks and directly modifies params.

Should arguments provided from config INI/TOML files/extra_config also bypass the command-line argument checks?

Environment

1. OS:

   william@xubuntu-dtrain:~/conf/backup$ uname -a
   Linux xubuntu-dtrain 5.15.0-112-generic #122-Ubuntu SMP Thu May 23 07:48:21 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux
   

2. python version:

   william@xubuntu-dtrain:~/conf/backup$ python3 -V
   Python 3.10.12
   

3. doit version:

   william@xubuntu-dtrain:~/conf/backup$ doit --version
   0.36.0
   lib @ /home/william/.local/lib/python3.10/site-packages/doit
   

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