bug: Trim fails if outputDirectory is not set

[christian-pinto]

Issue Description

if the outputDirectory parameter is not set in a trim operation the documentation states the arg defaults to none and output files are going to be saved in a temp location.

outputDirectory
Type: str | None

Default: None

Tuning Guidance: Always set this explicitly. If not set, models may be saved to a temporary location and lost.

In reality, if outputDirectory is omitted the operation fails saving the output files and crashes at the very end

The issue is here:

ado/plugins/operators/trim/src/trim/trim_sampler.py

Lines 430 to 437 in 7610059

	if should_stop:
	# Stopping info
	self.params.finalModelAutoGluonArgs.tabularPredictorArgs["path"] = (
	self.params.finalModelAutoGluonArgs.tabularPredictorArgs.get(
	"path", self.params.outputDirectory
	)
	+ "_finalized"
	)

if outputDirectory is None it should be replaced with a "". Autogluon will then save to "./_finalized"

How to reproduce

Run a TRIM operation omitting the outputDirectory field.

Expected behaviour

Outputs to be saved directly in the current working directory

Screenshots/Logs

message: "Operation exited due to the following error from a Ray Task: \e[36mray::RandomWalk.run()\e\
    [39m (pid=352390, ip=10.130.24.112, actor_id=58987b9c24363bbb293532c650000000,\
    \ repr=<ado.modules.operators.randomwalk.RandomWalk object at 0x7f5fa6f940d0>)\n\
    \  File \"/home/ray/anaconda3/lib/python3.11/concurrent/futures/_base.py\", line\
    \ 456, in result\n    return self.__get_result()\n           ^^^^^^^^^^^^^^^^^^^\n\
    \  File \"/home/ray/anaconda3/lib/python3.11/concurrent/futures/_base.py\", line\
    \ 401, in __get_result\n    raise self._exception\n           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n\
    \  File \"/tmp/ray/session_2026-07-02_23-28-37_581176_1/runtime_resources/uv/9456699ae58c80eb8e835b4e6772f5a54a1a4fe6/virtualenv/lib/python3.11/site-packages/ado/modules/operators/randomwalk.py\"\
    , line 718, in run\n    await self._sampleEntityAndAddMeasurementsToQueue(\n \
    \          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/tmp/ray/session_2026-07-02_23-28-37_581176_1/runtime_resources/uv/9456699ae58c80eb8e835b4e6772f5a54a1a4fe6/virtualenv/lib/python3.11/site-packages/ado/modules/operators/randomwalk.py\"\
    , line 897, in _sampleEntityAndAddMeasurementsToQueue\n    entities = await anext(iterator)\n\
    \               ^^^^^^^^^^^^^^^^^^^^^\n  File \"/tmp/ray/session_2026-07-02_23-28-37_581176_1/runtime_resources/uv/9456699ae58c80eb8e835b4e6772f5a54a1a4fe6/virtualenv/lib/python3.11/site-packages/trim/trim_sampler.py\"\
    , line 478, in async_wrapper\n    for entity_batch in self._core_iterator_logic(\n\
    \  File \"/tmp/ray/session_2026-07-02_23-28-37_581176_1/runtime_resources/uv/9456699ae58c80eb8e835b4e6772f5a54a1a4fe6/virtualenv/lib/python3.11/site-packages/trim/trim_sampler.py\"\
    , line 433, in _core_iterator_logic\n    self.params.finalModelAutoGluonArgs.tabularPredictorArgs.get(\n\
    TypeError: unsupported operand type(s) for +: 'NoneType' and 'str'."

Python/ado/system info

Please include the output of:

python --version
ado version
Your OS

Note: If you installed ado in editable mode (e.g., pip install -e .) or
ran uv sync, the version metadata may not be up to date. Please reinstall to
get an accurate version number:

# If you used uv sync:
uv sync --reinstall

# If you used pip install -e:
pip install -e . --force-reinstall --no-deps

Additional information

Add any other context about the problem here.

[VassilisVassiliadis]

this is fixed in my PR