Fix api_image_request usage

Signed-off-by: Christoph Auer <[email protected]>

Author: cau-git

docs/examples/post_process_ocr_with_vlm.py

@@ -278,14 +278,15 @@ def is_processable(self, doc: DoclingDocument, element: NodeItem) -> bool:
 
     def _annotate_images(self, images: Iterable[Image.Image]) -> Iterable[str]:
         def _api_request(image: Image.Image) -> str:
-            return api_image_request(
+            res = api_image_request(
                 image=image,
                 prompt=self.options.prompt,
                 url=self.options.url,
                 timeout=self.options.timeout,
                 headers=self.options.headers,
                 **self.options.params,
             )
+            return res[0]
 
         with ThreadPoolExecutor(max_workers=self.concurrency) as executor:
             yield from executor.map(_api_request, images)