fix(ui): set defaultValue to null for empty strings in workflow variable creation and updates [FLOW-DEV-30]

[billcookie]

Overview

Updates workflow-variable persistence in the Editor UI so that an empty-string defaultValue is sent as null during create/update operations (likely to represent “unset” more explicitly).

What I've done

• Convert defaultValue === "" to null when building creates payloads for batch updates.
• Convert defaultValue === "" to null when building updates payloads for batch updates.
• Convert defaultValue === "" to null onAdd` for single workflow variable creation (if creates fails).
• Convert defaultValue === "" to null onChange` for single workflow variable creation (if updates fails).

What I haven't done

How I tested

Screenshot

Which point I want you to review particularly

Memo

[Copilot]

Pull request overview

Updates workflow-variable persistence in the Editor UI so that an empty-string defaultValue is sent as null during create/update operations (likely to represent “unset” more explicitly).

Changes:

• Convert defaultValue === "" to null when building creates payloads for batch updates.
• Convert defaultValue === "" to null when building updates payloads for batch updates.

Comments suppressed due to low confidence (1)

ui/src/features/Editor/components/OverlayUI/components/Homebar/components/WorkflowVariablesDialog/hooks.ts:268

• creates currently sets index: localWorkflowVariables.length for every new variable. If multiple variables are created (or temp variables are reordered before submit), this sends the same index for each create and can produce incorrect ordering server-side. Consider deriving the index per created variable based on its current position in localWorkflowVariables (or base existing count + map index).

          type: change.workflowVariable.type,
          required: change.workflowVariable.required,
          publicValue: change.workflowVariable.public,
          index: localWorkflowVariables.length,
        }));

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[github-actions]

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