Fixed issue of adding a transition to a Note that is off of a section header (title)

PROMS/Volian.Controls.Library/DisplayTransition.cs

@@ -445,7 +445,7 @@ namespace Volian.Controls.Library
 				VETreeNode tvn = new VETreeNode(startitm, false);
 				tvn.Tag = startitm;
 				int active = this.tvTran.Nodes.Add(tvn);
-				if (startitm.ItemID == selitm.ItemID)
+				if (selitm !=null && startitm.ItemID == selitm.ItemID)
 				{
 					tvTran.SelectedNode = tvTran.Nodes[active];
 					setsel = true;