fix tests

Author: ssmike

ydb/core/kqp/runtime/kqp_compute_scheduler.cpp

@@ -498,9 +498,9 @@ class TSchedulerActor : public TActorBootstrapped<TSchedulerActor> {
         NActors::TExecutorPoolStats poolStats;
         TVector<NActors::TExecutorThreadStats> threadsStats;
         TlsActivationContext->ActorSystem()->GetPoolStats(poolId, poolStats, threadsStats);
-        Y_ENSURE(poolStats.MaxThreadCount > 0);
-        Opts.Counters->SchedulerCapacity->Set(poolStats.MaxThreadCount);
-        Opts.Scheduler->SetCapacity(poolStats.MaxThreadCount);
+        ui64 threads = Max<ui64>(poolStats.MaxThreadCount, 1);
+        Opts.Counters->SchedulerCapacity->Set(threads);
+        Opts.Scheduler->SetCapacity(threads);
     }
 
     STATEFN(State) {