Skip the permission update when the modal posts no change

- Assert that no per-permission state check runs in the batched read test

modules/permission-management/src/Volo.Abp.PermissionManagement.Web/Pages/AbpPermissionManagement/PermissionManagementModal.cshtml.cs

@@ -110,6 +110,11 @@ public class PermissionManagementModal : AbpPageModel
                 })
                 .ToArray();
 
+        if (updatePermissionDtos.IsNullOrEmpty())
+        {
+            return NoContent();
+        }
+
         await PermissionAppService.UpdateAsync(
             ProviderName,
             ProviderKey,

modules/permission-management/test/Volo.Abp.PermissionManagement.Domain.Tests/Volo/Abp/PermissionManagement/PermissionManager_Tests.cs

@@ -98,6 +98,7 @@ public class PermissionManager_Tests : PermissionTestBase
         _stateCheckerCounter.Reset();
         var grantedProviders = await _permissionManager.GetAsync(names, "Test", "Test");
         _stateCheckerCounter.BatchCheckCount.ShouldBe(1);
+        _stateCheckerCounter.SingleCheckCount.ShouldBe(0);
 
         grantedProviders.Result.Single(x => x.Name == "MyPermission1").IsGranted.ShouldBeTrue();
         grantedProviders.Result.Single(x => x.Name == "MyPermission5").IsGranted.ShouldBeFalse();