Range to Nullable conversion

[Antonio]

Is there any alternative to ***range front*** that returns a 
Nullable (i.e. **frontAsMonad** or **frontAsNullable**)?

I'm using Vibe.d and Nullable is the standard way to return an 
optional element:

```d
   @safe Nullable!Item getItem(int _id)
   {
     import std.algorithm : filter;

     with (items.filter!(item => item.id == _id))
     {
       if (empty)
         return Nullable!Item.init;
       else
         return front.nullable;
     }
   }
```

Can this code be written as a **simple** expression?  (without 
having to write helper methods).