Index: src/Common/SharpMap/Layers/LayerAttribute.cs
===================================================================
diff -u -r5fc71a385897af92ccb092f2f969b5709afab85a -r4c09f28891546d714fa6a15d36b70d8a6b9a4aa7
--- src/Common/SharpMap/Layers/LayerAttribute.cs	(.../LayerAttribute.cs)	(revision 5fc71a385897af92ccb092f2f969b5709afab85a)
+++ src/Common/SharpMap/Layers/LayerAttribute.cs	(.../LayerAttribute.cs)	(revision 4c09f28891546d714fa6a15d36b70d8a6b9a4aa7)
@@ -93,7 +93,7 @@
             {
                 var uniqueValues = new HashSet<IComparable>();
 
-                IEnumerable values = null;
+                IEnumerable values;
 
                 if (layer is VectorLayer)
                 {