Revert "ensure result queue not None, log on failure"

This reverts commit 4192df7.

Author: varun-edachali-dbx

src/databricks/sql/result_set.py

@@ -170,11 +170,7 @@ def close(self) -> None:
         been closed on the server for some other reason, issue a request to the server to close it.
         """
         try:
-            if self.results is not None:
-                self.results.close()
-            else:
-                logger.warning("result set close: results queue not initialized")
-
+            self.results.close()
             if (
                 self.status != CommandState.CLOSED
                 and not self.has_been_closed_server_side