resolved #242: throw EntityNotFoundException if there is no user with given id

Author: ismcagdas

aspnet-core/src/AbpCompanyName.AbpProjectName.Application/Users/UserAppService.cs

@@ -6,6 +6,7 @@
 using Abp.Application.Services;
 using Abp.Application.Services.Dto;
 using Abp.Authorization;
+using Abp.Domain.Entities;
 using Abp.Domain.Repositories;
 using Abp.IdentityFramework;
 using Abp.Localization;
@@ -129,7 +130,14 @@ protected override IQueryable<User> CreateFilteredQuery(PagedResultRequestDto in
 
         protected override async Task<User> GetEntityByIdAsync(long id)
         {
-            return await Repository.GetAllIncluding(x => x.Roles).FirstOrDefaultAsync(x => x.Id == id);
+            var user = await Repository.GetAllIncluding(x => x.Roles).FirstOrDefaultAsync(x => x.Id == id);
+
+            if (user == null)
+            {
+                throw new EntityNotFoundException(typeof(User), id);
+            }
+
+            return user;
         }
 
         protected override IQueryable<User> ApplySorting(IQueryable<User> query, PagedResultRequestDto input)