Complete the task for a void property instead of dead-lettering it 🟩

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

applications/abri/dispatch.py

@@ -23,6 +23,7 @@ from orchestration.abri_orchestrator import (
     DealDatabaseGateway,
     LogJobOrchestrationResult,
     LogJobWriteBackError,
+    PropertyReportedVoid,
     TenantDataSyncResult,
 )
 from utilities.aws_lambda.task_handler import NonRetriableTaskError
@@ -198,6 +199,13 @@ def _run_tenant_sync(request: AbriTriggerRequest, flows: AbriFlows) -> str:
     )
     if isinstance(outcome, AbriRequestRejected):
         raise AbriFlowRejectedError(flow="sync_tenant_data", rejection=outcome)
+    if isinstance(outcome, PropertyReportedVoid):
+        # Not a failure: an empty property has no signatories to sync, so
+        # redelivery could only park the message in the dead-letter queue.
+        return (
+            f"no live tenancy for place {outcome.place_ref}; "
+            "property noted as void"
+        )
     return (
         f"{len(outcome.contact_ids)} contacts created "
         f"({outcome.vulnerable_contact_count} vulnerable)"