Device providers - Fixed an issue removing device providers

Surface auto-arrange - Fixed a crash when arranging with no devices

src/Artemis.Core/Services/RgbService.cs

@@ -74,7 +74,7 @@ namespace Artemis.Core.Services
                     _modifyingProviders = true;
 
                     List<ArtemisDevice> toRemove = _devices.Where(a => deviceProvider.Devices.Any(d => a.RgbDevice == d)).ToList();
-                    Surface.Detach(deviceProvider.Devices);
+                    Surface.Detach(toRemove.Select(d => d.RgbDevice));
                     foreach (ArtemisDevice device in toRemove)
                         RemoveDevice(device);
 
@@ -118,7 +118,7 @@ namespace Artemis.Core.Services
                     _modifyingProviders = true;
 
                     List<ArtemisDevice> toRemove = _devices.Where(a => deviceProvider.Devices.Any(d => a.RgbDevice == d)).ToList();
-                    Surface.Detach(deviceProvider.Devices);
+                    Surface.Detach(toRemove.Select(d => d.RgbDevice));
                     foreach (ArtemisDevice device in toRemove)
                         RemoveDevice(device);
 

src/Artemis.Core/Services/Storage/Models/SurfaceArrangement.cs

@@ -79,6 +79,11 @@ namespace Artemis.Core.Services.Models
         public void Arrange(List<ArtemisDevice> devices)
         {
             ArrangedDevices.Clear();
+            
+            // Not much to do here
+            if (!devices.Any())
+                return;
+
             foreach (ArtemisDevice surfaceDevice in devices)
             {
                 surfaceDevice.X = 0;