Update app.py

app.py

@@ -111,7 +111,8 @@ def convert_video(video_file, quality, aspect_ratio, video_url):
             with open(path, 'r') as file:
                 text_contents.append(file.read())
 
-    return html_links, video_paths, text_contents
+    return html_links or "", video_paths or [""], text_contents or [""]
+
 
 video_file = gr.inputs.File(label="Video File")
 quality = gr.inputs.Dropdown(