fetch_trace returns empty for runs without messages key

[niilooy]

Problem

fetchers.py only extracts outputs.messages:

messages = data.get("messages")
output_messages = (data.get("outputs") or {}).get("messages")
return messages or output_messages or []

• Fails for: tool runs, chains returning dicts/strings/nested structures
• Works for: LLM runs, chains with outputs.messages, retriever runs

Possible Fix

Add fallback to return raw outputs when no messages key found

[dhanlon-intellica]

also running into a similar issue