[BUG] Nonetype error on empty config

[Descent098]

When registering your first command there's an error because the macro object is a none type:

ahd register code "code ." "."
Registering macro code
        Command: code .
        Paths: .
Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "C:\Python311\Scripts\ahd.exe\__main__.py", line 7, in <module>
  File "C:\Python311\Lib\site-packages\ahd\cli.py", line 152, in main
    register(arguments["<name>"], arguments["<command>"], arguments["<paths>"], config)
  File "C:\Python311\Lib\site-packages\ahd\configuration.py", line 116, in register
    config["macros"][macro_name] = {
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^
TypeError: 'NoneType' object does not support item assignment