Update app.py

app.py

@@ -69,7 +69,7 @@ async def niji_api(prompt, progress=gr.Progress(), max_retries=5, backoff_factor
             return Image.open(BytesIO(response.content))
         except requests.exceptions.RequestException as e:
             logger.error(f"Failed to fetch image")
-            raise
+            return None
 
     def download_and_split_image(url):
         img = fetch_image(url)