Status 200 after entering an incorrect Id for GET / notification endpoint

While checking OLMIS-5859, I noticed that when I enter an Id that has too few characters, the response receives 200 code instead of information that the user with the given Id doesn't exist.

Reproduction steps:

1. Use the GET /api/notification endpoint.

2. Enter Id that has too few characters e.g. a337ec45-31a0-4f2b-9b2e-a1 and click the "GET" button.

Expected behavior:

• The 400 code should be returned, along with the "UUID a337ec45-31a0-4f2b-9b2e-a1 parameter has wrong format for field userId." message. Or information that the user with the given Id doesn't exist.