Invoking Upsert with alternate keys throws exception if pipeline simulation is turned on

[Zerajima]

The exception thrown is: "The id parameter '00000000-0000-0000-0000-000000000000' for entity logical name 'dcpwr_datamigration' is not valid."

It is thrown by XrmFakedContext.GetEntityById_Internal, which is called from MiddlewareBuilderPipelineExtensions.GetPreImageEntityForRequest. Here is a full callstack:

System.InvalidOperationException: The id parameter '00000000-0000-0000-0000-000000000000' for entity logical name 'dcpwr_datamigration' is not valid.
   at FakeXrmEasy.XrmFakedContext.GetEntityById_Internal(String sLogicalName, Guid id, Type t)
   at FakeXrmEasy.XrmFakedContext.GetEntityById(String logicalName, Guid id)
   at FakeXrmEasy.Middleware.Pipeline.MiddlewareBuilderPipelineExtensions.GetPreImageEntityForRequest(IXrmFakedContext context, OrganizationRequest request)
   at FakeXrmEasy.Middleware.Pipeline.MiddlewareBuilderPipelineExtensions.<>c__DisplayClass4_0.<UsePipelineSimulation>b__1(IXrmFakedContext context, OrganizationRequest request)
   at FakeXrmEasy.Middleware.MiddlewareBuilder.<>c__DisplayClass9_0.<Build>b__2(OrganizationRequest request)
   at FakeItEasy.ReturnValueConfigurationExtensions.<>c__DisplayClass8_0`2.<ReturnsLazily>b__0(IFakeObjectCall call)
   at FakeItEasy.Configuration.RuleBuilder.ReturnValueConfiguration`1.<>c__DisplayClass28_0.<ReturnsLazily>b__0(IInterceptedFakeObjectCall call)
   at FakeItEasy.Configuration.BuildableCallRule.Apply(IInterceptedFakeObjectCall fakeObjectCall)
   at FakeItEasy.Core.FakeManager.ApplyBestRule(IInterceptedFakeObjectCall fakeObjectCall)
   at FakeItEasy.Core.FakeManager.FakeItEasy.Core.IFakeCallProcessor.Process(InterceptedFakeObjectCall fakeObjectCall)
   at FakeItEasy.Creation.CastleDynamicProxy.CastleDynamicProxyGenerator.ProxyInterceptor.Intercept(IInvocation invocation)
   at Castle.DynamicProxy.AbstractInvocation.Proceed()
   at Castle.Proxies.ObjectProxy.Execute(OrganizationRequest request)
   at FakeXrmEasy.Middleware.Crud.MiddlewareBuilderCrudExtensions.<>c__DisplayClass7_0.<AddFakeUpdate>b__1(Entity e)
   at FakeItEasy.CallbackConfigurationExtensions.<>c__DisplayClass2_0`2.<Invokes>b__0(IFakeObjectCall call)
   at FakeItEasy.Configuration.BuildableCallRule.Apply(IInterceptedFakeObjectCall fakeObjectCall)
   at FakeItEasy.Core.FakeManager.ApplyBestRule(IInterceptedFakeObjectCall fakeObjectCall)
   at FakeItEasy.Core.FakeManager.FakeItEasy.Core.IFakeCallProcessor.Process(InterceptedFakeObjectCall fakeObjectCall)
   at FakeItEasy.Creation.CastleDynamicProxy.CastleDynamicProxyGenerator.ProxyInterceptor.Intercept(IInvocation invocation)
   at Castle.DynamicProxy.AbstractInvocation.Proceed()
   at Castle.Proxies.ObjectProxy.Update(Entity entity)
   at FakeXrmEasy.Middleware.Crud.FakeMessageExecutors.UpsertRequestExecutor.Execute(OrganizationRequest request, IXrmFakedContext ctx)
   at FakeXrmEasy.Middleware.Crud.MiddlewareBuilderCrudExtensions.ProcessRequest(IXrmFakedContext context, OrganizationRequest request)
   at FakeXrmEasy.Middleware.Crud.MiddlewareBuilderCrudExtensions.<>c__DisplayClass3_0.<UseCrud>b__1(IXrmFakedContext context, OrganizationRequest request)
   at FakeXrmEasy.Middleware.Pipeline.MiddlewareBuilderPipelineExtensions.<>c__DisplayClass4_0.<UsePipelineSimulation>b__1(IXrmFakedContext context, OrganizationRequest request)
   at FakeXrmEasy.Middleware.MiddlewareBuilder.<>c__DisplayClass9_0.<Build>b__2(OrganizationRequest request)
   at FakeItEasy.ReturnValueConfigurationExtensions.<>c__DisplayClass8_0`2.<ReturnsLazily>b__0(IFakeObjectCall call)
   at FakeItEasy.Configuration.RuleBuilder.ReturnValueConfiguration`1.<>c__DisplayClass28_0.<ReturnsLazily>b__0(IInterceptedFakeObjectCall call)
   at FakeItEasy.Configuration.BuildableCallRule.Apply(IInterceptedFakeObjectCall fakeObjectCall)
   at FakeItEasy.Core.FakeManager.ApplyBestRule(IInterceptedFakeObjectCall fakeObjectCall)
   at FakeItEasy.Core.FakeManager.FakeItEasy.Core.IFakeCallProcessor.Process(InterceptedFakeObjectCall fakeObjectCall)
   at FakeItEasy.Creation.CastleDynamicProxy.CastleDynamicProxyGenerator.ProxyInterceptor.Intercept(IInvocation invocation)
   at Castle.DynamicProxy.AbstractInvocation.Proceed()
   at Castle.Proxies.ObjectProxy.Execute(OrganizationRequest request)
   at FakeXrmEasy.FakeMessageExecutors.ExecuteMultipleRequestExecutor.Execute(OrganizationRequest request, IXrmFakedContext ctx)