[ELI-BUG] - reverting to old behaviour as we want an error here

Author: TOEL2

src/eligibility_signposting_api/repos/campaign_repo.py

@@ -64,7 +64,7 @@ def _load_campaign_configs_from_s3(self) -> list[CampaignConfig]:
                 campaign_objects = self.s3_client.list_objects(Bucket=self.bucket_name)
 
             with xray_recorder.in_subsegment("get_objects"):
-                for campaign_object in campaign_objects.get("Contents", []):
+                for campaign_object in campaign_objects.get("Contents"):
                     response = self.s3_client.get_object(
                         Bucket=self.bucket_name,
                         Key=f"{campaign_object['Key']}",