Update app.py

app.py

@@ -31,6 +31,9 @@ from about import (
 
 
 def process_image_from_binary(img_stream):
+    if img_stream is None:
+        print("no image binary")
+        return
     image_data = base64.b64decode(img_stream)
     image_bytes = BytesIO(image_data)
     img = Image.open(image_bytes)