Don't check if controller is okay for deleting until we need to

sbws/lib/circuitbuilder.py

@@ -90,10 +90,10 @@ class CircuitBuilder:
 
     def __del__(self):
         c = self.controller
-        if not stem_utils.is_controller_okay(c):
-            return
         if not self.close_circuits_on_exit:
             return
+        if not stem_utils.is_controller_okay(c):
+            return
         for circ_id in self.built_circuits:
             if c.get_circuit(circ_id, default=None):
                 c.close_circuit(circ_id)