Mac view is not created until one of presentation attributes set explicitly
## 🔙 Regression

<!--- Summary description of the regression --->

### Old (and correct) behavior
If a view class in a Mac app has no presentation attribute over it, the presenter will assume a new window presentation and will create such a view without problems.

### Current behavior
* Log message `[Verbose] PresentationAttribute not found for TipViewController. Assuming new window presentation`
* view class constructor not called
* view not showed


### Reproduction steps
* grab TipCalc sample with my MvvmCross 9 adaptation from here https://github.com/MvvmCross/MvvmCross-Samples/pull/182
* comment out explicit `MvxWindowPresentationAttribute` set for `TipViewController`
* set log level to `Verbose`
* run applcation
* observer that no window or any other UI is created
*  uncomment `MvxWindowPresentationAttribute` back and observe that window is created and sample works as expected

### Configuration

**Version:** 9.0.9

**Platform:** 
- [ ] :iphone: iOS
- [ ] :robot: Android
- [ ] :checkered_flag: WPF
- [ ] :earth_americas: UWP
- [x] :apple: MacOS
- [ ] :tv: tvOS
- [ ] :monkey: Xamarin.Forms
