feat: simplify heading level feature configuration and error handling

mineru/backend/vlm/token_to_middle_json.py

@@ -12,17 +12,14 @@ from mineru.version import __version__
 
 heading_level_import_success = False
 llm_aided_config = get_llm_aided_config()
-if llm_aided_config is not None:
-    title_aided_config = llm_aided_config.get('title_aided', None)
-    if title_aided_config is not None:
-        if title_aided_config.get('enable', False):
-            try:
-                from mineru.utils.llm_aided import llm_aided_title
-                from mineru.backend.pipeline.model_init import AtomModelSingleton
-                heading_level_import_success = True
-            except Exception as e:
-                logger.warning("The heading level feature cannot be used. If you need to use the heading level feature, "
-                               "please execute `pip install mineru[core]` to install the required packages.")
+if llm_aided_config and llm_aided_config.get('title_aided', {}).get('enable', False):
+    try:
+        from mineru.utils.llm_aided import llm_aided_title
+        from mineru.backend.pipeline.model_init import AtomModelSingleton
+        heading_level_import_success = True
+    except Exception as e:
+        logger.warning("The heading level feature cannot be used. If you need to use the heading level feature, "
+                        "please execute `pip install mineru[core]` to install the required packages.")
 
 
 def token_to_page_info(token, image_dict, page, image_writer, page_index) -> dict: