return None in case of empty respose

Signed-off-by: varun-edachali-dbx <varun.edachali@databricks.com>

Author: varun-edachali-dbx

src/databricks/sql/backend/sea/queue.py

@@ -150,13 +150,8 @@ def __init__(
         initial_links = result_data.external_links or []
         first_link = next((l for l in initial_links if l.chunk_index == 0), None)
         if not first_link:
-            raise ServerOperationError(
-                "No initial link found for chunk 0",
-                {
-                    "operation-id": statement_id,
-                    "diagnostic-info": None,
-                },
-            )
+            # possibly an empty response
+            return None
 
         # Track the current chunk we're processing
         self._current_chunk_link = first_link