When chaining tokens, if nothing was selected in a CPF, evaluation wo…

…uld log (#8763)

and error because it would seek an item out of the range of the array.

src/Orchard.Web/Modules/Orchard.ContentPicker/Tokens/FieldTokens.cs

@@ -3,6 +3,7 @@
 using Orchard.Events;
 using Orchard.ContentPicker.Fields;
 using Orchard.Localization;
+using NHibernate.Util;
 
 namespace Orchard.ContentPicker.Tokens {
     public interface ITokenProvider : IEventHandler {
@@ -28,7 +29,10 @@ public void Describe(dynamic context) {
         public void Evaluate(dynamic context) {
             context.For<ContentPickerField>("ContentPickerField")
                 .Token("Content", (Func<ContentPickerField, object>)(field => field.Ids[0]))
-                .Chain("Content", "Content", (Func<ContentPickerField, object>)(field => _contentManager.Get(field.Ids[0])))
+                .Chain("Content", "Content", (Func<ContentPickerField, object>)(field => {
+                    var id = field.Ids.Any() ? field.Ids[0] : 0; 
+                    return _contentManager.Get(id);
+                }))
                 ;
         }
     }