remove excessive null check, is also serves for null check.
remove excessive null check, is also serves for null check.


MrDaedra/Avalonia,SuperJMN/Avalonia,MrDaedra/Avalonia,AvaloniaUI/Avalonia,jazzay/Perspex,SuperJMN/Avalonia,jkoritzinsky/Avalonia,Perspex/Perspex,wieslawsoltes/Perspex,wieslawsoltes/Perspex,AvaloniaUI/Avalonia,jkoritzinsky/Avalonia,SuperJMN/Avalonia,AvaloniaUI/Avalonia,wieslawsoltes/Perspex,SuperJMN/Avalonia,grokys/Perspex,SuperJMN/Avalonia,AvaloniaUI/Avalonia,akrisiun/Perspex,AvaloniaUI/Avalonia,wieslawsoltes/Perspex,jkoritzinsky/Avalonia,jkoritzinsky/Avalonia,jkoritzinsky/Avalonia,SuperJMN/Avalonia,jkoritzinsky/Avalonia,SuperJMN/Avalonia,grokys/Perspex,AvaloniaUI/Avalonia,jkoritzinsky/Perspex,jkoritzinsky/Avalonia,Perspex/Perspex,AvaloniaUI/Avalonia,wieslawsoltes/Perspex,wieslawsoltes/Perspex,wieslawsoltes/Perspex