Fix unit tests.

modules/feature-management/src/Volo.Abp.FeatureManagement.Application/Volo/Abp/FeatureManagement/FeatureAppService.cs

@@ -69,7 +69,7 @@ public class FeatureAppService : FeatureManagementAppServiceBase, IFeatureAppSer
         return new FeatureGroupDto
         {
             Name = groupDefinition.Name,
-            DisplayName = groupDefinition.DisplayName.Localize(StringLocalizerFactory),
+            DisplayName = groupDefinition.DisplayName?.Localize(StringLocalizerFactory),
             Features = new List<FeatureDto>()
         };
     }
@@ -79,8 +79,8 @@ public class FeatureAppService : FeatureManagementAppServiceBase, IFeatureAppSer
         return new FeatureDto
         {
             Name = featureDefinition.Name,
-            DisplayName = featureDefinition.DisplayName.Localize(StringLocalizerFactory),
-            Description = featureDefinition.Description.Localize(StringLocalizerFactory),
+            DisplayName = featureDefinition.DisplayName?.Localize(StringLocalizerFactory),
+            Description = featureDefinition.Description?.Localize(StringLocalizerFactory),
 
             ValueType = featureDefinition.ValueType,
 

modules/permission-management/src/Volo.Abp.PermissionManagement.Application/Volo/Abp/PermissionManagement/PermissionAppService.cs

@@ -103,7 +103,7 @@ public class PermissionAppService : ApplicationService, IPermissionAppService
     {
         return new PermissionGrantInfoDto {
             Name = permission.Name,
-            DisplayName = permission.DisplayName.Localize(StringLocalizerFactory),
+            DisplayName = permission.DisplayName?.Localize(StringLocalizerFactory),
             ParentName = permission.Parent?.Name,
             AllowedProviders = permission.Providers,
             GrantedProviders = new List<ProviderInfoDto>()
@@ -117,7 +117,7 @@ public class PermissionAppService : ApplicationService, IPermissionAppService
         return new PermissionGroupDto
         {
             Name = group.Name,
-            DisplayName = group.DisplayName.Localize(StringLocalizerFactory),
+            DisplayName = group.DisplayName?.Localize(StringLocalizerFactory),
             DisplayNameKey = localizableDisplayName?.Name,
             DisplayNameResource = localizableDisplayName?.ResourceType != null
                 ? LocalizationResourceNameAttribute.GetName(localizableDisplayName.ResourceType)