Update app.py

app.py

@@ -379,7 +379,11 @@ def capture_image(pil_img):
                 
                 # else:
                 #     QMessageBox.critical(self, "Error", "Please enter a slide number.")        
-                # image_counter = 1    
+                # image_counter = 1 
+                else:
+                    annotated_img= im0
+                    filled_text= "White blood cells are not presented in the image."
+    
                 return annotated_img ,filled_text
                 # Process detections
                 # for i, det in enumerate(pred):