fix: type checking

Author: srini047

integrations/ollama/src/haystack_integrations/components/embedders/ollama/document_embedder.py

@@ -152,6 +152,9 @@ async def _embed_batch_async(
         results = await asyncio.gather(*tasks, return_exceptions=True)
 
         for _idx, res in enumerate(results):
+            if isinstance(res, Exception):
+                raise RuntimeError(f"Error in batch {_idx}: {res}")
+                continue
             all_embeddings.extend(res["embeddings"])
 
         return all_embeddings