Update app.py

app.py

@@ -35,7 +35,7 @@ def inference(
     dtype = torch.float16 if torch_device == "cuda" else torch.float32
 
     try:
-        revision = f"refs/pr/{discuss_nr}"
+        revision = f"refs/pr/{discuss_nr}" if (discuss_nr != "" or discuss_nr is None) else None
         pipe = DiffusionPipeline.from_pretrained(repo_id, revision=revision, torch_dtype=dtype)
         pipe.to(torch_device)