[UWP] fixes crash after reset text color (#6435)

diff --git a/Xamarin.Forms.Platform.UAP/FrameRenderer.cs b/Xamarin.Forms.Platform.UAP/FrameRenderer.cs
index 08f6ab1..8de526f 100644 (file)
--- a/Xamarin.Forms.Platform.UAP/FrameRenderer.cs
+++ b/Xamarin.Forms.Platform.UAP/FrameRenderer.cs
@@ -64,15 +64,8 @@ namespace Xamarin.Forms.Platform.UWP
                        Color backgroundColor = Element.BackgroundColor;
                        if (Control != null)
                        {
-                               if (!backgroundColor.IsDefault)
-                               {
-                                       Control.Background = backgroundColor.ToBrush();
-                               }
-                               else
-                               {
-                                       Control.ClearValue(BackgroundProperty);
-                               }
-                       }                       
+                               Control.Background = backgroundColor.IsDefault ? null : backgroundColor.ToBrush();
+                       }
                }
 
                void PackChild()