allow matching option using score only in national data import

as we're not creating the options from script it makes more sense to
match using the score than the description as then don't need to do a
lot of redundant config

crowdsourcer/management/commands/import_national_data.py

@@ -175,10 +175,13 @@ def get_score(self, q, row, details, authority):
                 score = 0
                 desc = "No"
         else:
-            for opt in details["options"]:
-                if opt["score"] == score:
-                    desc = opt["desc"]
-                    break
+            if details.get("options"):
+                for opt in details["options"]:
+                    if opt["score"] == score:
+                        desc = opt["desc"]
+                        break
+            else:
+                desc = None
 
         return desc, score
 
@@ -271,7 +274,12 @@ def import_answers(self, user, rt, df, q, details):
                 option = None
                 if not details.get("update_points_only", False):
                     try:
-                        option = Option.objects.get(question=q, description=score_desc)
+                        if score_desc is not None:
+                            option = Option.objects.get(
+                                question=q, description=score_desc
+                            )
+                        else:
+                            option = Option.objects.get(question=q, score=score)
                     except Option.DoesNotExist:
                         self.print_info(
                             f"No option found for {q.number}, {score_desc}, {authority.name}",