Remove property node from search results

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/SearchWindowProvider.cs

             var nodeEntries = new List<NodeEntry>();
             foreach (var type in Assembly.GetAssembly(typeof(AbstractMaterialNode)).GetTypes())
             {
-                if (type.IsClass && !type.IsAbstract && (type.IsSubclassOf(typeof(AbstractMaterialNode))))
+                if (type.IsClass && !type.IsAbstract && (type.IsSubclassOf(typeof(AbstractMaterialNode))) && type != typeof(PropertyNode))
                 {
                     var attrs = type.GetCustomAttributes(typeof(TitleAttribute), false) as TitleAttribute[];
                     if (attrs != null && attrs.Length > 0)