Update Umbraco to 7.12.2

WebCms/Umbraco/PartialViewMacros/Templates/MultinodeTree-picker.cshtml

@@ -1,21 +1,25 @@
+@using Umbraco.Core.Models
+@using Umbraco.Web
 @inherits Umbraco.Web.Macros.PartialViewMacroPage
 
 @*
-    This snippet lists the items from a Multinode tree picker, using the pickers default settings.
-    Content Values stored as xml.
+    This snippet lists the items from a Multinode tree picker, using the picker's default settings.
+    Content Values stored as XML.
 
     To get it working with any site's data structure, set the selection equal to the property which has the
     multinode treepicker (so: replace "PropertyWithPicker" with the alias of your property).
 *@
 
-@{ var selection = CurrentPage.PropertyWithPicker.Split(','); }
+@{ var selection = Model.Content.GetPropertyValue<IEnumerable<IPublishedContent>>("PropertyWithPicker").ToArray();  }
 
-<ul>
-    @foreach (var id in selection)
-    {
-        var item = Umbraco.Content(id);
-        <li>
-            <a href="@item.Url">@item.Name</a>
-        </li>
-    }
-</ul>
+@if (selection.Length > 0)
+{
+    <ul>
+        @foreach (var item in selection)
+        {
+            <li>
+                <a href="@item.Url">@item.Name</a>
+            </li>
+        }
+    </ul>
+}