Add error if output has no data

Walkthrough

この変更は、src/convert_fgd_dem/converter.py内のrunメソッドに新しいチェックを追加し、出力されたデジタル標高モデル（DEM）が有効な標高データを含むかどうかを判断します。無効なデータの場合、処理が中断され、エラーメッセージが出力されることで、ユーザーにフィードバックが提供され、より堅牢なエラーハンドリングが実現されます。

Changes

ファイルパス	変更内容概要
`src/convert_fgd_dem/converter.py`	`run`メソッドにDEMの標高データを評価するチェックを追加。無効な場合は処理を中断し、エラーメッセージを送信する機能を実装。

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant Converter
    participant DEM

    User->>Converter: run()
    Converter->>DEM: Check elevation data
    alt No valid data
        Converter->>User: Emit failure signal
        Converter->>Converter: Set process_interrupted = True
    else Valid data found
        Converter->>Converter: Continue processing
    end

Poem

🐰 ぴょんぴょん跳ねて、嬉しさ広がる
新しいチェックで、データは守られる
無効な高さは、もうこわくない！
フィードバック受けて、心も軽やかに
さあ、進もう、夢の中へ！ 🌟

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MIERUNE / convert_fgd_dem