Store only actual and prediction_id on score_actuals task
malformed input like

```
"actual_records": [
      {
        "null": [
          "2.2",
          "5.0",
          "1.5",
          "Iris-virginica"
        ],
        "actual": "6.0",
        "prediction_id": "6efdf66d-40a2-4074-b3db-8900c622e07f"
      }
    ],
```
https://app-staging.auger.ai/admin/cluster_tasks/29100
https://app-staging.auger.ai/admin/experiment_sessions/5534

Is stored to feather:

```
,prediction_id,class,null,petal_length,petal_width,prediction_group_id,sepal_length,sepal_width
0,6efdf66d-40a2-4074-b3db-8900c622e07f,6.0,['2.2' '5.0' '1.5' 'Iris-virginica'],5.0,1.5,136eeb53-585f-4833-a3be-da4279f3aaa2,6.0,2.2
```


diff --git a/a2ml/api/model_review/model_review.py b/a2ml/api/model_review/model_review.py
index b468ae0..91d91d6 100644
--- a/a2ml/api/model_review/model_review.py
+++ b/a2ml/api/model_review/model_review.py
@@ -137,6 +137,8 @@ class ModelReview(object):
 
         ds_actuals = DataFrame.create_dataframe(actuals_path, actual_records,
             features=features)
+        if features is None:
+            ds_actuals.select(['prediction_id', 'actual'])
 
         actuals_count = ds_actuals.count()
 
diff --git a/tests/model_review/test_model_review.py b/tests/model_review/test_model_review.py
index 3e38995..184142c 100644
--- a/tests/model_review/test_model_review.py
+++ b/tests/model_review/test_model_review.py
@@ -393,8 +393,8 @@ def test_score_actuals_with_no_predictions_in_model_folder():
       os.remove(actuals_path)
 
     actuals = [
-      { 'prediction_id':'09aaa96b-5d9c-4c45-ab04-726da868624b', 'species':'versicolor' },
-      { 'prediction_id':'5e5ad22b-6789-47c6-9a4d-a3a998065127', 'species':'virginica' }
+      { 'prediction_id':'09aaa96b-5d9c-4c45-ab04-726da868624b', 'actual':'versicolor' },
+      { 'prediction_id':'5e5ad22b-6789-47c6-9a4d-a3a998065127', 'actual':'virginica' }
     ]
 
     try:
['tests/model_review/test_model_review.py', 'a2ml/api/model_review/model_review.py']