Fix potential bugs

aspnet-core/modules/common/LINGYUN.Abp.Identity.HttpApi/LINGYUN/Abp/Identity/IOrganizationUnitController.cs

@@ -12,7 +12,7 @@ using Volo.Abp.Identity;
 namespace LINGYUN.Abp.Identity
 {
     [RemoteService(Name = IdentityRemoteServiceConsts.RemoteServiceName)]
-    [Area("organization-unit")]
+    [Area("identity")]
     [ControllerName("organization-unit")]
     [Route("api/identity/organization-unit")]
     public class IOrganizationUnitController : AbpController, IOrganizationUnitAppService

aspnet-core/modules/identity/LINGYUN.Abp.Identity.Application.Contracts/LINGYUN/Abp/Identity/IdentityPermissionDefinitionProvider.cs

@@ -9,7 +9,8 @@ namespace LINGYUN.Abp.Identity
         public override void Define(IPermissionDefinitionContext context)
         {
             var identityGroup = context.GetGroupOrNull(Volo.Abp.Identity.IdentityPermissions.GroupName);
-            
+            if (identityGroup != null)
+            {
                 var origanizationUnitPermission = identityGroup.AddPermission(IdentityPermissions.OrganizationUnits.Default, L("Permission:OrganizationUnitManagement"));
                 origanizationUnitPermission.AddChild(IdentityPermissions.OrganizationUnits.Create, L("Permission:Create"));
                 origanizationUnitPermission.AddChild(IdentityPermissions.OrganizationUnits.Update, L("Permission:Edit"));
@@ -17,6 +18,7 @@ namespace LINGYUN.Abp.Identity
                 origanizationUnitPermission.AddChild(IdentityPermissions.OrganizationUnits.ManageRoles, L("Permission:ChangeRoles"));
                 origanizationUnitPermission.AddChild(IdentityPermissions.OrganizationUnits.ManageUsers, L("Permission:ChangeUsers"));
             }
+        }
 
         private static LocalizableString L(string name)
         {