Raise an exception in AzulClient index methods when bundle notifications are disabled

Author: dsotirho-ucsc

src/azul/azulclient.py

@@ -128,6 +128,8 @@ def mirror_source_message(self,
         )
 
     def local_reindex(self, catalog: CatalogName, prefix: str) -> int:
+        if not config.enable_bundle_notifications:
+            raise AzulClientError('Bundle notifications are disabled')
         service = self.index_repository_service
         notifications: JSONs = [
             # Notifications sent organically by DSS had a different structure,
@@ -148,6 +150,8 @@ def index(self,
               notifications: Iterable[JSON],
               delete: bool = False
               ):
+        if not config.enable_bundle_notifications:
+            raise AzulClientError('Bundle notifications are disabled')
         errors = defaultdict[int, int](int)
         missing = []
         indexed = 0