Check NullOrEmpty for sortings instead of null coalescing in TenantManagement

modules/tenant-management/src/Volo.Abp.TenantManagement.EntityFrameworkCore/Volo/Abp/TenantManagement/EntityFrameworkCore/EfCoreTenantRepository.cs

@@ -62,7 +62,7 @@ namespace Volo.Abp.TenantManagement.EntityFrameworkCore
                     u =>
                         u.Name.Contains(filter)
                 )
-                .OrderBy(sorting ?? nameof(Tenant.Name))
+                .OrderBy(sorting.IsNullOrEmpty() ? nameof(Tenant.Name) : sorting)
                 .PageBy(skipCount, maxResultCount)
                 .ToListAsync(GetCancellationToken(cancellationToken));
         }

modules/tenant-management/src/Volo.Abp.TenantManagement.MongoDB/Volo/Abp/TenantManagement/MongoDb/MongoTenantRepository.cs

@@ -56,7 +56,7 @@ namespace Volo.Abp.TenantManagement.MongoDB
                     u =>
                         u.Name.Contains(filter)
                 )
-                .OrderBy(sorting ?? nameof(Tenant.Name))
+                .OrderBy(sorting.IsNullOrEmpty() ? nameof(Tenant.Name) : sorting)
                 .As<IMongoQueryable<Tenant>>()
                 .PageBy<Tenant, IMongoQueryable<Tenant>>(skipCount, maxResultCount)
                 .ToListAsync(GetCancellationToken(cancellationToken));