fix: Handle empty GPT responses and log outputs

app.py

@@ -592,6 +592,7 @@ async def reason_track(
     try:
         # estimate_distance_gpt reads the file from disk
         results = await asyncio.to_thread(estimate_distance_gpt, input_path, track_list)
+        logging.info(f"GPT Output for Video Track Update:\n{results}")
     except Exception as e:
         logging.exception("GPT reasoning failed")
         _safe_delete(input_path)

utils/gpt_distance.py

@@ -122,7 +122,11 @@ def estimate_distance_gpt(
         with urllib.request.urlopen(req) as response:
             resp_data = json.loads(response.read().decode('utf-8'))
             
-        content = resp_data['choices'][0]['message']['content']
+        content = resp_data['choices'][0]['message'].get('content')
+        if not content:
+            logger.warning("GPT returned empty content. Full response: %s", resp_data)
+            return {}
+
         # Clean potential markdown headers if GPT ignores instruction
         if content.startswith("```json"):
             content = content[7:]