NullCheck for DragPoint #438
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The following exception has been reported:
Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.
Full Exception:
bei AvalonDock.Controls.TransformExtensions.TransformToDeviceDPI(Visual visual, Point pt)
bei AvalonDock.DockingManager.AvalonDock.Controls.IOverlayWindowHost.HitTestScreen(Point dragPoint)
bei AvalonDock.Controls.DragService.<>c__DisplayClass9_0.b__0(IOverlayWindowHost oh)
bei System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable
1 source, Func2 predicate)bei AvalonDock.Controls.DragService.UpdateMouseLocation(Point dragPosition)
bei AvalonDock.Controls.DragService.Drop(Point dropLocation, Boolean& dropHandled)
bei AvalonDock.Controls.LayoutFloatingWindowControl.FilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
bei AvalonDock.Controls.LayoutAnchorableFloatingWindowControl.FilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
The pull request should fix this exception