fix:修复职业报错的情况

backend/api/utils/skill_detail.py

@@ -60,7 +60,8 @@ def skill_detail_for_level(skill_data: dict[str, Any], level: int | None) -> dic
         return result
 
     attribute = {**level_info, **detail}
-    attribute['detail'] = attribute.get('optionDesc', '')
+    option_desc = attribute.get('optionDesc')
+    attribute['detail'] = option_desc if isinstance(option_desc, str) else ''
 
     for key, value in (attribute.get('optionValue') or {}).items():
         attribute['detail'] = attribute['detail'].replace(f'{{{key}}}', str(value))