fixing #377 (empty nbest_predictions.json)

examples/run_squad.py

@@ -620,7 +620,7 @@ def write_predictions(all_examples, all_features, all_results, n_best_size,
                 all_predictions[example.qas_id] = ""
             else:
                 all_predictions[example.qas_id] = best_non_null_entry.text
-                all_nbest_json[example.qas_id] = nbest_json
+            all_nbest_json[example.qas_id] = nbest_json
 
     with open(output_prediction_file, "w") as writer:
         writer.write(json.dumps(all_predictions, indent=4) + "\n")