CloudSearch: Fix AttributeError when record_stats = False.

While the stub-timer I introduced earlier takes care of some issues, it
doesn't take care of when we explicitly set the variable to None!

r2/r2/lib/cloudsearch.py

@@ -550,7 +550,8 @@ def basic_query(query=None, bq=None, faceting=None, size=1000,
                                        response)
     finally:
         connection.close()
-        timer.stop()
+        if timer is not None:
+            timer.stop()
     
     return json.loads(response)