fix(rest-api): preserve addressless machine interfaces

[kfelternv]

REST machine inventory currently passes Core's empty interface address list through as nil, causing the non-null database write to fail and the interface to be omitted while inventory processing continues. This change maps empty address lists to an empty database array and adds regression coverage showing an addressless interface remains in inventory.

Related issues

• NVBug 6503989

Type of Change

• Add - New feature or capability
• Change - Changes in existing functionality
• Fix - Bug fixes
• Remove - Removed features or deprecated functionality
• Internal - Internal changes (refactoring, tests, docs, etc.)

Breaking Changes

• This PR contains breaking changes

Testing

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed
• No testing required (docs, internal refactor, etc.)

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