avoid uninit hiveId (#9831)

Author: uzhastik

ydb/core/viewer/viewer_tenantinfo.h

@@ -640,7 +640,7 @@ class TJsonTenantInfo : public TViewerPipeClient {
                 TIntrusivePtr<TDomainsInfo> domains = AppData()->DomainsInfo;
                 auto* domain = domains->GetDomain();
                 TStackVec<TTabletId, 64> tablets;
-                TTabletId hiveId;
+                TTabletId hiveId = {};
                 if (entry.DomainInfo) {
                     for (TTabletId tabletId : entry.DomainInfo->Params.GetCoordinators()) {
                         tablets.emplace_back(tabletId);