## Task

Evaluate this code review comment. Read the source file and determine if the issue is valid.

**Instructions:**
1. Read the file mentioned in the review: `packages/core/ai_content_platform/vimax/pipelines/idea2video.py`
2. Check line 238 and surrounding context
3. Determine if the review feedback is valid
4. If valid: Fix the issue in the code
5. If invalid: Explain why the feedback doesn't apply

**Important:** Be concise. Either fix the code or explain in 2-3 sentences why it's not applicable.

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# Review Comment

- **Author:** coderabbitai[bot]
- **File:** `packages/core/ai_content_platform/vimax/pipelines/idea2video.py`
- **Line:** 238
- **Date:** 2026-02-03
- **Comment ID:** 2756943914
- **URL:** https://github.com/donghaozhang/video-agent-skill/pull/16#discussion_r2756943914

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_⚠️ Potential issue_ | _🟡 Minor_

**Guard against `None` duration in format string.**

If `completed_at` is not set (e.g., on early failure paths), `result.duration` returns `None`, causing a `TypeError` when formatting with `:.1f`.
