Update gradio_app.py

gradio_app.py

@@ -53,13 +53,13 @@ def function(model_name: str, num_molecules: int, seed_num: int) -> tuple[PIL.Im
     config = model_configs[model_name]
     config.sample_num = num_molecules
 
-    if seed_num is not None or seed_num != '':
+    if seed_num is None or seed_num.strip() == "":
+        config.seed = random.randint(0, 10000)
+    else:
         try:
             config.seed = int(seed_num)
-        except ValueError: 
-            raise gr.Warning("The seed must be an integer value!")
-    else:
-        config.seed = random.randint(0, 10000)
+        except ValueError:
+            raise gr.Error("The seed must be an integer value!")
 
 
     inferer = Inference(config)