Only adds ultranest information gain if num_live_points is designated. Will...

Only adds ultranest information gain if num_live_points is designated. Will later add information_gain property for ultranest.ReactiveNestedSampler runs.

bilby/core/sampler/ultranest.py

@@ -390,7 +390,8 @@ class Ultranest(NestedSampler):
         self.result.nested_samples = nested_samples
         self.result.log_evidence = out["logz"]
         self.result.log_evidence_err = out["logzerr"]
-        self.result.information_gain = np.power(out["logzerr"], 2) * self.kwargs["num_live_points"]
+        if "num_live_points" in self.kwargs:
+            self.result.information_gain = np.power(out["logzerr"], 2) * self.kwargs["num_live_points"]
 
         self.result.outputfiles_basename = self.outputfiles_basename
         self.result.sampling_time = datetime.timedelta(seconds=self.total_sampling_time)