fix: improved error logging

app.py

@@ -84,8 +84,7 @@ with block:
             if configs.enable_segment_all:
                 masks, _ = service.predict_all(sam, image)
             else:
-                gr.Warning('Segment-all disabled, set point label(s) before running')
-                return inputs[cutout_gallery], inputs[masks_annotated_image]
+                raise gr.Error('Segment-all disabled, set point label(s) before running')
         else:
             masks, _ = service.predict_conditioned(sam,
                                                    image,