NRL-518 Pydantic will ensure extension is always there

Author: axelkrastek1-nhs

layer/nrlf/core/validators.py

@@ -142,8 +142,7 @@ def validate(self, data: Dict[str, Any] | DocumentReference):
             self._validate_author(resource)
             self._validate_type_category_mapping(resource)
             self._validate_content(resource)
-            if resource.content[0].extension:
-                self._validate_content_extension(resource)
+            self._validate_content_extension(resource)
 
         except StopValidationError:
             logger.log(LogReference.VALIDATOR003)