No title for trees. They just block things

EduNetworkBuilder/NetworkDevice.cs

@@ -1142,6 +1142,7 @@ namespace EduNetworkBuilder
         private List<string> DeviceCaptions(CaptionType What)
         {
             List<string> WhatToShow = new List<string>();
+            if (myType == NetworkComponentType.tree) return WhatToShow; //return nothing
             switch(What)
             {
                 case CaptionType.none: