Swallow exceptions in render loop.

And remove debug output statement.

src/Avalonia.Visuals/Rendering/DeferredRenderer.cs

@@ -287,7 +287,11 @@ namespace Avalonia.Rendering
                 scene = _scene;
             }
 
-            Render(scene);
+            try
+            {
+                Render(scene);
+            }
+            catch { }
         }
 
         private IRenderTargetBitmapImpl GetOverlay(Size size, double scaling)

src/Windows/Avalonia.Direct2D1/HwndRenderTarget.cs

@@ -30,8 +30,6 @@ namespace Avalonia.Direct2D1
             Direct2DFactory = AvaloniaLocator.Current.GetService<Factory1>();
             DirectWriteFactory = AvaloniaLocator.Current.GetService<SharpDX.DirectWrite.Factory>();
 
-            System.Diagnostics.Debug.WriteLine("Created HwndRenderTarget");
-
             var featureLevels = new[]
             {
                 SharpDX.Direct3D.FeatureLevel.Level_12_1,