added check for connected kinect

InputSystems/ANX.InputDevices.Windows.Kinect/Kinect.cs

@@ -73,18 +73,24 @@ namespace ANX.InputDevices.Windows.Kinect
         #endregion // Private Members
 
         public Kinect()
+        {
+            if (Runtime.Kinects.Count > 0)
             {
                 pNui = Runtime.Kinects[0];
                 pNui.Initialize(RuntimeOptions.UseDepthAndPlayerIndex | RuntimeOptions.UseSkeletalTracking | RuntimeOptions.UseColor);
                 pNui.SkeletonEngine.TransformSmooth = true;
-
+            }
+            else
+            {
+                throw new Exception("No Kinect was detected, please connect it to your Computer before running this program and make sure you install the Kinect SDK from Microsoft.");
+            }
 
 
             this.cache = new Vector3[21];
             //init for the first time
             for (int i = 0; i < 21; ++i)
             {
-                this.cache[i]=Vector3.Zero;
+                this.cache[i] = Vector3.Zero;
             }
             //Added parameters which where used in our Kinect project
             var parameters = new TransformSmoothParameters
@@ -178,7 +184,7 @@ namespace ANX.InputDevices.Windows.Kinect
 
         public MotionSensingDeviceState GetState()
         {
-            return new MotionSensingDeviceState(rgb, depth, cache[0], cache[1], cache[2], cache[3], cache[4], cache[5], cache[6], cache[7], cache[8], cache[9], cache[10],cache[11], cache[12], cache[13], cache[14], cache[15], cache[16], cache[17], cache[18], cache[19], cache[20]);
+            return new MotionSensingDeviceState(rgb, depth, cache[0], cache[1], cache[2], cache[3], cache[4], cache[5], cache[6], cache[7], cache[8], cache[9], cache[10], cache[11], cache[12], cache[13], cache[14], cache[15], cache[16], cache[17], cache[18], cache[19], cache[20]);
         }