Fixed data check in case log noise evidence is np.nan

bilby/core/result.py

@@ -1295,7 +1295,8 @@ class ResultList(list):
             raise CombineResultError("Cannot combine results: inconsistent parameters")
 
     def _check_consistent_data(self):
-        if not np.all([res.log_noise_evidence == self[0].log_noise_evidence for res in self]):
+        if not np.all([res.log_noise_evidence == self[0].log_noise_evidence for res in self])\
+                and not np.all([np.isnan(res.log_noise_evidence) for res in self]):
             raise CombineResultError("Cannot combine results: inconsistent data")
 
     def _check_consistent_sampler(self):

test/result_test.py

@@ -508,6 +508,11 @@ class TestResultList(unittest.TestCase):
         with self.assertRaises(bilby.result.CombineResultError):
             self.nested_results.combine()
 
+    def test_combine_inconsistent_data_nan(self):
+        self.nested_results[0].log_noise_evidence = np.nan
+        self.nested_results[1].log_noise_evidence = np.nan
+        self.nested_results.combine()
+
     def test_combine_inconsistent_sampling_data(self):
         result = bilby.core.result.Result(
             label=self.label, outdir=self.outdir, sampler='cpnest',