Rules: Return 404 when DID rules not found. Fixes rucio#6334

lib/rucio/api/rule.py

@@ -17,7 +17,7 @@
 
 from rucio.api.permission import has_permission
 from rucio.common.config import config_get_bool
-from rucio.common.exception import AccessDenied
+from rucio.common.exception import AccessDenied, RuleNotFound
 from rucio.common.schema import validate_schema
 from rucio.common.types import InternalAccount, InternalScope
 from rucio.common.utils import api_update_return_dict
@@ -159,10 +159,15 @@ def list_replication_rules(filters={}, vo='def', *, session: "Session"):
         account = '*'
     filters['account'] = InternalAccount(account=account, vo=vo)
 
+    count = 0
     rules = rule.list_rules(filters, session=session)
     for r in rules:
+        count += 1
         yield api_update_return_dict(r, session=session)
 
+    if count == 0:
+        raise RuleNotFound(f"No rules found for filters: {filters}")
+
 
 @read_session
 def list_replication_rule_history(rule_id, issuer, vo='def', *, session: "Session"):