fix(integrations/zendesk): Prevent nullable user fields

[mikee-b]

Resolves BE-1330

Zendesk custom user fields are nullable, but the type in our action's output is not. Allowing null values would've been breaking, so instead we filter out null values.

[linear-code]

BE-1330

[greptile-apps]

Greptile Summary

This PR fixes a type mismatch where Zendesk custom user fields can return null values from the API, but the action output schema declared them as non-nullable strings. Rather than widening the output type (which would be breaking), null entries are now filtered out before the data reaches consumers.

• _zdUserSchema is extended to accept z.record(z.string().nullable()) when parsing raw Zendesk responses, then transformUser uses pickBy with a type-guard predicate to strip null-valued keys before returning the non-nullable User type.
• The version is bumped from 3.1.2 to 3.1.3 to reflect the patch.

Confidence Score: 5/5

This is a small, well-scoped fix that correctly handles nullable Zendesk user fields without changing the output contract.

The change is minimal and correct: the schema extension allows null values only in the intermediate parsing layer, and the pickBy filter reliably removes them before the data is returned to callers. No existing API contract is changed.

No files require special attention.

Important Files Changed

Filename	Overview
integrations/zendesk/src/definitions/schemas.ts	Extends _zdUserSchema to accept nullable user field values from Zendesk, then filters nulls out in transformUser before returning the non-nullable output type.
integrations/zendesk/integration.definition.ts	Patch version bump from 3.1.2 to 3.1.3 to reflect the bug fix.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["Zendesk API Response\nuser_fields: { k: string | null }"] --> B["_zdUserSchema.parse()\n(now accepts nullable values)"]
    B --> C["ZendeskUser\nuser_fields: Record<string, string | null> | undefined"]
    C --> D["transformUser()"]
    D --> E{"user_fields\ntruthy?"}
    E -- "Yes" --> F["pickBy(user_fields,\nvalue !== null)"]
    F --> G["userFields: Record<string, string>\n(nulls removed)"]
    E -- "No" --> H["userFields: undefined"]
    G --> I["User output\nuserFields: z.record(z.string()).optional()"]
    H --> I

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_{Reviews (2): Last reviewed commit: "changed zendesk user schema" | Re-trigger Greptile}

[mikee-b]

@greptile review again

[makhlouf1102]

LGTMT