Fixed not being able to add to Userdata list

Upsilon/BaseTypes/UserData/ListUserData.cs

@@ -86,15 +86,12 @@ namespace Upsilon.BaseTypes.UserData
             index--;
             if (index > List.Count)
             {
-                if (index == List.Count)
-                {
-                    List.Add(value.ToCSharpObject());
-                }
-                else
-                {
-                    throw new Exception(
-                        $"Tried adding an item to a list at position {index}, but list is only of length {List.Count}");
-                }
+                throw new Exception(
+                    $"Tried adding an item to a list at position {index}, but list is only of length {List.Count}");
+            }
+            if (index == List.Count)
+            {
+                List.Add(value.ToCSharpObject());
             }
             else
             {