null-conditional for boolean operation should be typed to nullable

The Null Conditional operator when used in conjunction with a boolean function should result in a nullable value and not require parentheses around it before checking GetValueOrDefault or HasValue

```
Dim ids As List(Of Integer) = Nothing
If Not ids?.Any() Then
End If
```
vs
```
Dim ids As List(Of Integer) = Nothing
If Not (ids?.Any()).GetValueOrDefault Then
End If
```