LED visualizer - Don't attempt to render really tiny LEDs

src/Artemis.UI.Shared/Controls/DeviceVisualizerLed.cs

@@ -36,6 +36,10 @@ namespace Artemis.UI.Shared.Controls
 
         private void CreateLedGeometry()
         {
+            // The minimum required size for geometry to be created
+            if (Led.RgbLed.Size.Width < 2 || Led.RgbLed.Size.Height < 2)
+                return;
+
             switch (Led.RgbLed.Shape)
             {
                 case Shape.Custom: