BUG: fix result saving by setting rstate to None

bilby/core/sampler/dynesty.py

@@ -621,6 +621,7 @@ class Dynesty(NestedSampler):
             sampling_time_s=self.sampling_time.seconds,
             ncores=self.kwargs.get("queue_size", 1),
         )
+        self.kwargs["rstate"] = None
 
     def _update_sampling_time(self):
         end_time = datetime.datetime.now()