fix

app.py

@@ -121,13 +121,13 @@ def server(input: Inputs, output: Outputs, session: Session):
         ]
 
         return ui.layout_column_wrap(*value_boxes, width = 1 / len(value_boxes))
-        
+
     @output
     @render.image
     def image():
         here = Path(__file__).parent
         img = {"src": input.image_input()[0]['datapath'], "width": "500px"} 
-        return img
+        return img if img else None
 
 
 # "darkorange", "purple", "cyan4"