[Proposal] Less verbose null checks

Can't we writ this statement:
```VB.NET
If pop IsNot Nothing Then pop.IsOpen = False
```

just as:
```VB.NET
pop?.IsOpen = False
```

Or at least:
```VB.NET
If pop Then pop.IsOpen = False
```

I am using `option strict of`, so, again, why can't an object converted to a Boolean in a condition context?

Or at least:
```VB.NET
If pop? Then pop.IsOpen = False
```

and of course, I prefer `pop?.IsOpen = False` the most.