Update image path handling in http_bot to use the first image path if available

app.py

@@ -268,7 +268,7 @@ def http_bot(
         logger.info(f"==== Image paths ====\n{all_image_paths}")
 
         response, _ = predict(message, 
-                                all_image_paths if len(all_image_paths) > 0 else None,
+                                all_image_paths[0] if len(all_image_paths) > 0 else None,
                                 state,
                                 max_input_tiles, 
                                 temperature,