Fix bug cart payment payload creation

[Francois-Gomis]

Reason for change

Impossible to create Alma payment for new product without image

Linear task

Code changes

GetMediaUrl path must be null

How to test

Create a new product without image and order it with Alma As a reviewer, you are encouraged to test the PR locally.

Checklist for authors and reviewers

• [X] The title of the PR uses business wording, not technical jargon, for the changelog readers to understand it
• [X] The PR implements the changes asked in the referenced task / issue
• [X] The automated tests are compliant with the testing strategy
• [X] The tests are relevant, and cover the corner/error cases, not only the happy path
• [X] You understand the impact of this PR on existing code/features

Non applicable

[sonarcloud[bot]]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

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