fix portable and 3.5 project references

MediaBrowser.Server.Implementations/Collections/ManualCollectionsFolder.cs

@@ -0,0 +1,31 @@
+using System.Linq;
+using MediaBrowser.Controller.Entities;
+
+namespace MediaBrowser.Server.Implementations.Collections
+{
+    public class ManualCollectionsFolder : BasePluginFolder
+    {
+        public ManualCollectionsFolder()
+        {
+            Name = "Collections";
+        }
+
+        public override bool IsVisible(User user)
+        {
+            if (!GetChildren(user, true).Any())
+            {
+                return false;
+            }
+
+            return base.IsVisible(user);
+        }
+
+        public override bool IsHidden
+        {
+            get
+            {
+                return !ActualChildren.Any() || base.IsHidden;
+            }
+        }
+    }
+}