chore: switch print statements to debug logging (#2569)

Signed-off-by: Panos Vagenas <[email protected]>

Author: vagenas

docling/models/layout_model.py

@@ -167,9 +167,11 @@ def __call__(
             valid_pages.append(page)
             valid_page_images.append(page_image)
 
-        print(f"{len(pages)=}, {pages[0].page_no}-{pages[-1].page_no}")
-        print(f"{len(valid_pages)=}")
-        print(f"{len(valid_page_images)=}")
+        _log.debug(f"{len(pages)=}")
+        if pages:
+            _log.debug(f"{pages[0].page_no}-{pages[-1].page_no}")
+        _log.debug(f"{len(valid_pages)=}")
+        _log.debug(f"{len(valid_page_images)=}")
 
         # Process all valid pages with batch prediction
         batch_predictions = []