fix(license): ensure IP address is included in anonymous user payload

[amadulhaxxani]

Problem description

When an anonymous user accepts a CLARIN license that does not require any additional user fields, the POST request to /core/clarinusermetadata/manage is sent with an empty body.
This happens because userMetadata$ is never initialised for anonymous users – the loadUserRegistrationAndUserMetadata() method is only called for authenticated users. As a result, the IP address is missing from the payload and the backend rejects the request.

Analysis

The accept() method expects userMetadata$.value.page to be an array before it pushes the IP metadata. For anonymous users who do not interact with any form fields, this array remains undefined.
The fix initialises an empty page array using buildPaginatedList before the IP filtering logic, ensuring the IP metadata is always included.
Unit tests were added to cover the two affected cases: userMetadata$ is null, and userMetadata$ has an empty page array.

Copilot review

• Requested review from Copilot

[Copilot]

Pull request overview

Fixes anonymous CLARIN license acceptance by ensuring the POST payload to the CLARIN user metadata manage endpoint always includes an IP metadata entry, even when no extra fields are required and userMetadata$ was never initialized for anonymous users.

Changes:

• Initialize userMetadata$ to an empty PaginatedList when missing (or when its page is missing) before filtering/pushing the IP entry.
• Add unit tests covering anonymous-user acceptance when userMetadata$ is null and when it contains an empty page array.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
src/app/bitstream-page/clarin-license-agreement-page/clarin-license-agreement-page.component.ts	Initializes userMetadata$ to guarantee an array exists for adding the IP metadata before sending the POST request.
src/app/bitstream-page/clarin-license-agreement-page/clarin-license-agreement-page.component.spec.ts	Adds tests asserting the request payload contains the IP metadata for anonymous users in the two affected initialization states.