fix: improve null handling in DefaultViewLocator

[glennawatson]

Co-authored-by: matej.hrlec@inel.com

[codecov]

Codecov Report

Merging #2919 (d1981ca) into main (2be5893) will decrease coverage by 0.38%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2919      +/-   ##
==========================================
- Coverage   72.56%   72.18%   -0.39%     
==========================================
  Files         140      140              
  Lines        4906     4900       -6     
==========================================
- Hits         3560     3537      -23     
- Misses       1346     1363      +17     

Impacted Files	Coverage Δ
src/ReactiveUI/View/DefaultViewLocator.cs	93.22% <100.00%> (+0.91%)	⬆️
.../ReactiveUI/Platforms/net/PlatformRegistrations.cs	57.14% <0.00%> (-28.58%)	⬇️
...iveUI/Platforms/net/ComponentModelTypeConverter.cs	52.77% <0.00%> (-19.45%)	⬇️
src/ReactiveUI.Wpf/Registrations.cs	82.35% <0.00%> (-11.77%)	⬇️
src/ReactiveUI.Winforms/Registrations.cs	82.35% <0.00%> (-11.77%)	⬇️
src/ReactiveUI/RxApp.cs	75.34% <0.00%> (-6.85%)	⬇️

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[github-actions]

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