Fixed posible faults on rollback

Author: GrigoriyPA

ydb/library/yql/providers/pq/async_io/dq_pq_rd_read_actor.cpp

@@ -762,7 +762,10 @@ void TDqPqRdReadActor::Handle(NFq::TEvRowDispatcher::TEvMessageBatch::TPtr& ev)
     ui64 bytes = 0;
     for (const auto& message : ev->Get()->Record.GetMessages()) {
         const auto& offsets = message.GetOffsets();
-        YQL_ENSURE(!offsets.empty(), "Expected non empty message batch");
+        if (offsets.empty()) {
+            Stop(NDqProto::StatusIds::INTERNAL_ERROR, {TIssue("Got unexpected empty batch from row dispatcher")});
+            return;
+        }
 
         activeBatch.Data.emplace_back(ev->Get()->GetPayload(message.GetPayloadId()));
         bytes += activeBatch.Data.back().GetSize();