AB#81518 No longer log about null values.

[buckett]

The initial reason for adding this logging has passed (Instructure have deployed the change) and while it's slightly interesting that we still have some null values it's not worth chasing them down.

[Copilot]

Pull Request Overview

Stop emitting logs for null values in LTI custom claims now that upstream has addressed the issue.

• Removed the null-value logging check in JWTService.
• Deleted the associated unit tests that only exercised the removed logging helper.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/main/java/uk/ac/ox/ctl/ltiauth/JWTService.java	Removes checkForNullCustomValues and its invocation from createJWT to stop logging null custom claim values.
src/test/java/uk/ac/ox/ctl/ltiauth/JWTServiceTest.java	Deletes tests that only validated the removed logging helper.

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