Narrow try/except to only the list_repo_tree API call

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

logging_utils.py

@@ -87,14 +87,11 @@ def _make_path(now, uid):
 
 def _list_existing_files(api, repo_id):
     try:
-        return sorted(
-            f.path
-            for f in api.list_repo_tree(repo_id, repo_type="dataset", path_in_repo="data")
-            if f.path.endswith(".parquet")
-        )
+        entries = api.list_repo_tree(repo_id, repo_type="dataset", path_in_repo="data")
     except Exception as e:
         print(f"[log] could not list existing files (empty repo?): {e}")
         return []
+    return sorted(f.path for f in entries if f.path.endswith(".parquet"))
 
 
 def _build_add_ops(batch):