fixed check for analysis result validity

image_prediction/flask.py

@@ -63,7 +63,7 @@ def make_prediction_server(predict_fn: Callable):
         logger.info("Analysing...")
         predictions = predict_fn_wrapped(request.data)
 
-        if predictions:
+        if predictions is not None:
             response = jsonify(predictions)
             logger.info("Analysis completed.")
             return response