Fix compiler warnings related to nullability in Tokens module

[HunorTotBagi]

Readiness checklist

• I added/updated unit tests.
• I added/updated integration tests.
• I ensured that the PR title is good enough for the changelog.
• I labeled the PR.

Removed various code issues and warnings found in the Tokens module related to null values revealed by ReSharper.

[coderabbitai]

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