Update app.py

app.py

@@ -39,7 +39,9 @@ if not os.path.exists(model):
 @spaces.GPU(duration=120)
 def predict(jobname, inputs, recycling_steps, sampling_steps, diffusion_samples):
     jobname = re.sub(r'[<>:"/\\|?*]', '_', jobname)
-    os.makedirs(jobname)
+    if jobname == "":
+        raise gr.Error("Job name empty or only invalid characters. Choose a plaintext name.")
+    os.makedirs(jobname, exist_ok=True)
     """format Gradio Component:
     # {"chains": [
     #     {