Remove redundant check

Author: edhall-nhs

lambdas/backend/src/service/fhir_service.py

@@ -337,8 +337,8 @@ def is_valid_date_to(self, immunization: dict, date_to: Optional[datetime.date])
 
         return occurrence_datetime.date() <= date_to
 
+    @staticmethod
     def make_identifier_search_bundle(
-        self,
         resource: Optional[dict],
         version_id: Optional[int],
         elements: Optional[set[str]],
@@ -349,9 +349,6 @@ def make_identifier_search_bundle(
             f"&_elements={','.join(sorted(elements))}" if elements else ""
         )
 
-        if not resource:
-            return self.make_empty_identifier_search_bundle(searched_url)
-
         meta = {"versionId": version_id}
 
         # Full Immunization payload to be returned if only the identifier parameter was provided and truncated when