[Bug]:TypeError: 'PageChars' while processing xlsx file (excel)

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Describe the bug

MineruExecutionError: Mineru command failed with return code 1: ['2026-07-02 08:25:13.423 | ERROR | main:_process_task:1154 - Async task failed: 10306380-016b-434d-ab67-c25c588184d4', "TypeError: 'PageChars' object is not iterable", 'Error: 1 task(s) failed while processing documents:', '- task#1 (excel_table): Task 10306380-016b-434d-ab67-c25c588184d4 failed for task#1 [excel_table]: {"task_id": "10306380-016b-434d-ab67-c25c588184d4", "status": "failed", "backend": "pipeline", "file_names": ["excel_table"], "created_at": "2026-07-02T08:24:46.020703+00:00", "started_at": "2026-07-02T08:24:46.021503+00:00", "completed_at": "2026-07-02T08:25:13.423297+00:00", "error": "'PageChars' object is not iterable", "status_url": "http://127.0.0.1:55399/tasks/10306380-016b-434d-ab67-c25c588184d4", "result_url": "http://127.0.0.1:55399/tasks/10306380-016b-434d-ab67-c25c588184d4/result", "queued_ahead": 0}']

Steps to reproduce

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Expected Behavior

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Additional Information

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