Update app.py

app.py

@@ -23,11 +23,13 @@ device="cuda"
 pipe = pipe.to(device)
 
 @spaces.GPU
-def run(prompt, negative_prompt="", guidance_scale=7.0, pag_scale=3.0, pag_layers=["mid"], randomize_seed=True, seed=42, progress=gr.Progress(track_tqdm=True)):
+def run(prompt, negative_prompt=None, guidance_scale=7.0, pag_scale=3.0, pag_layers=["mid"], randomize_seed=True, seed=42, progress=gr.Progress(track_tqdm=True)):
     prompt = prompt.strip()
     negative_prompt = negative_prompt.strip()
     if(randomize_seed):
         seed = random.randint(0, sys.maxsize)
+    if(negative_prompt == ""):
+        negative_prompt = None
     if(prompt == "" and negative_prompt == ""):
         guidance_scale = 0.0