_createOnAfterAsync var removed from code gen DataSvc when DataSvcCustom="true" on operation

[Simke11]

When DataSvcCustom="true" is set on an operation,

private static readonly Func<Entity, Task> _createOnAfterAsync; 

is removed from generated DataSvc class, but is still used in the generated method, e.g.

public static Task CreateAsync(Entity value)
{
	return DataSvcInvoker.Default.InvokeAsync(typeof(EntityDataSvc), async () => 
	{
		await CreateOnImplementationAsync(value);
		if (_createOnAfterAsync != null) await _createOnAfterAsync(value);
	});
}

This results in _createOnAfterAsync having to be declared in custom partial DataSvc class.

_createOnAfterAsync declaration should either stay in code gen'd DataSvc file, or remove

if (_createOnAfterAsync != null) await _createOnAfterAsync(value);

from code gen'd method and let it be added in custom DataSvc method implementation if needed.

Operation definition for the above scenario:

<Operation Name="Create" OperationType="Custom" AutoImplement="None" WebApiMethod="HttpPost" ValueType="Reservation" WebApiStatus="Accepted" DataSvcCustom="true">