Update app.py

app.py

@@ -53,7 +53,11 @@ def detect_ellipses(img_path):
     		# temp.size.width = detEllipses[i].size.height;
     		# temp.angle = -detEllipses[i].angle;
 
-    return [Image.fromarray(imgN), json.dumps(result.tolist())]
+        result = result.tolist()
+    else:
+        result = []
+    
+    return [Image.fromarray(imgN), json.dumps(result)]
 
 examples = []