Handle dataPath = null case

[kirklandsign]

Summary

Handle dataPath = null case

Test plan

CI

cc @cbilgin

[pytorch-bot]

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❌ 2 New Failures, 2 Cancelled Jobs, 16 Pending, 1 Unrelated Failure

As of commit b386eec with merge base 58bd91c ():

NEW FAILURES - The following jobs have failed:

• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t 25651c413ed539d8e3d449b6a5125f81a3af207a8dce2aea8abbef3b23ceae24 /exec failed with exit code 1
• Test CUDA Builds / export-gemma3-cuda-non-quantized / linux-job (gh)
  AttributeError: 'NoneType' object has no attribute 'reorder_iter_loops'

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• Check Labels / Check labels (gh)
• periodic (gh)

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / unittest-editable / windows / windows-job (gh) (detected as infra flaky with no log or failing log classifier)

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[Copilot]

Pull Request Overview

This PR adds null-safety handling for the dataPath parameter in the LlmModule constructor by conditionally creating an empty list when dataPath is null instead of passing null to List.of().

Key changes:

• Modified the constructor to check if dataPath is null before creating the list
• Reformatted the constructor call across multiple lines for better readability

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