Update gradio_app.py

gradio_app.py

@@ -52,11 +52,12 @@ def function(model_name: str, num_molecules: int, seed_num: int) -> tuple[PIL.Im
     config = model_configs[model_name]
     config.sample_num = num_molecules
 
+    print(seed_num)
     if seed_num is not None:
         try:
             config.seed = int(seed_num)
         except:
-            return
+            raise Exception("The seed must be an integer value!")
     else:
         config.seed = random.randint(0, 10000)