Update app.py

app.py

@@ -122,12 +122,13 @@ with gr.Blocks() as demo:
             if model_year:
                 model_year = model_year.group()
 
-            video_link = f"Source: {output['input_documents'][0].metadata['video_link']}"
             
-            for i in range(0,len(output['input_documents'])):
-                if model_year in output['input_documents'][i].metadata['title']:
-                    video_link = f"Source: {output['input_documents'][i].metadata['video_link']}"
-                    break
+            video_link = f"Source: {output['input_documents'][0].metadata['video_link']}"
+            if model_year is not None:
+                for i in range(0,len(output['input_documents'])):
+                    if model_year in output['input_documents'][i].metadata['title']:
+                        video_link = f"Source: {output['input_documents'][i].metadata['video_link']}"
+                        break
             
         
         output_text_with_images = f"{output_text}<br>{images_html}{video_link}"