Make gap_treatment_strength optional with a default value of None

[savithru-flex]

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[Copilot]

Pull request overview

This PR changes the gap_treatment_strength parameter to be optional with a default value of None instead of 0, removing it from JSON output when not explicitly set.

• Changed default value from 0 to None in both MeshingParams and VolumeMeshingParams classes
• Added conditional check to only include gapTreatmentStrength in output JSON when the value is not None
• Updated test files and reference JSON files to remove the default gapTreatmentStrength: 0.0 entries

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
flow360/component/simulation/meshing_param/params.py	Changed default value of gap_treatment_strength from 0 to None in both parameter classes
flow360/component/simulation/translator/volume_meshing_translator.py	Added conditional check to only include gapTreatmentStrength in output when not None
tests/simulation/translator/test_volume_meshing_translator.py	Removed gapTreatmentStrength: 0.0 from test assertions
tests/simulation/translator/ref/volume_meshing/*.json	Removed gapTreatmentStrength: 0.0 from reference JSON files
tests/ref/simulation/*.json	Removed gap_treatment_strength: 0.0 from reference JSON files

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