Fix 'qmk compile' mass_compile execution

[zvecr]

Description

$ cd keyboards/lets_split
$ qmk compile -km all
Ψ Retrieving list of keymaps for keyboard "None"...
<class 'ValueError'>

and

$ qmk compile -kb lets_split -km all
Ψ Retrieving list of keymaps for keyboard "lets_split/rev2"...
Ψ Preparing target list...
<class 'KeyError'>
☒ 'no_temp'
Traceback (most recent call last):
  File "/home/zvecr/qmk_firmware_clean/.direnv/python-3.11/lib/python3.11/site-packages/milc/milc.py", line 604, in __call__
    return self.__call__()
           ^^^^^^^^^^^^^^^
  File "/home/zvecr/qmk_firmware_clean/.direnv/python-3.11/lib/python3.11/site-packages/milc/milc.py", line 609, in __call__
    return self._subcommand(self)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/home/zvecr/qmk_firmware_clean/lib/python/qmk/decorators.py", line 27, in wrapper
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/home/zvecr/qmk_firmware_clean/lib/python/qmk/decorators.py", line 47, in wrapper
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/home/zvecr/qmk_firmware_clean/lib/python/qmk/cli/compile.py", line 56, in compile
    return mass_compile(cli)
           ^^^^^^^^^^^^^^^^^
  File "/home/zvecr/qmk_firmware_clean/lib/python/qmk/cli/mass_compile.py", line 111, in mass_compile
    return mass_compile_targets(targets, cli.args.clean, cli.args.dry_run, cli.args.no_temp, cli.config.mass_compile.parallel, **build_environment(cli.args.env))
                                                                           ^^^^^^^^^^^^^^^^
  File "/home/zvecr/qmk_firmware_clean/.direnv/python-3.11/lib/python3.11/site-packages/milc/attrdict.py", line 32, in __getattr__
    return self.__getitem__(key)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/home/zvecr/qmk_firmware_clean/.direnv/python-3.11/lib/python3.11/site-packages/milc/attrdict.py", line 37, in __getitem__
    return self._data[key]
           ~~~~~~~~~~^^^^^
KeyError: 'no_temp

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Keyboard (addition or update)
• Keymap/layout/userspace (addition or update)
• Documentation

Issues Fixed or Closed by This PR

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).