Correct variable name

src/objectifier.py

@@ -87,7 +87,7 @@ def result_to_dict(res, base_url):
     return {
         "labels": map(lambda d: d.label, res.detections),
         "detections": map(detection_to_dict, res.detections),
-        "output": base_url + d.outfile,
+        "output": base_url + res.outfile,
     }
 
 # @app.put("/images")