fix(admin): show grade label even when estimatedGrade is null on tasks/grade page

[KATO-Hiro]

close #3704

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: cf76a2d9-3c5c-4c56-ac28-94ee2c64d1b4

📥 Commits

Reviewing files that changed from the base of the PR and between f5c694d and 502b863.

📒 Files selected for processing (1)

• src/routes/(admin)/tasks/grade/+page.svelte

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch #3704

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[KATO-Hiro]

LGTM