only call ask_updates on gen if its implemented

libensemble/utils/runners.py

@@ -160,7 +160,12 @@ def _get_initial_ask(self, libE_info) -> npt.NDArray:
         return H_out
 
     def _get_points_updates(self, batch_size: int) -> (npt.NDArray, list):
-        return self.gen.ask_numpy(batch_size), self.gen.ask_updates()
+        numpy_out = self.gen.ask_numpy(batch_size)
+        if callable(getattr(self.gen, "ask_updates", None)):
+            updates = self.gen.ask_updates()
+        else:
+            updates = None
+        return numpy_out, updates
 
     def _convert_tell(self, x: npt.NDArray) -> list:
         self.gen.tell_numpy(x)
@@ -179,7 +184,11 @@ def _get_initial_ask(self, libE_info) -> npt.NDArray:
     def _ask_and_send(self):
         """Loop over generator's outbox contents, send to manager"""
         while not self.gen.thread.outbox.empty():  # recv/send any outstanding messages
-            points, updates = self.gen.ask_numpy(), self.gen.ask_updates()
+            points = self.gen.ask_numpy()
+            if callable(getattr(self.gen, "ask_updates", None)):
+                updates = self.gen.ask_updates()
+            else:
+                updates = None
             if updates is not None and len(updates):
                 self.ps.send(points)
                 for i in updates: