Added logic to protect against failures when an invalid transition text is removed.

Added logic to protect against failures when an invalid transition text is selected.

PROMS/VEPROMS.CSLA.Library/Extension/TransitionExt.cs

@@ -497,6 +497,9 @@ namespace VEPROMS.CSLA.Library
 		}
 		private static string BuildString(TransitionBuilder tb)
 		{
+			//Invalid Transition Check
+			if (tb._ToItem.ActiveParent == null || tb._RangeItem.ActiveParent == null)
+				return "?";
 			int startIndex = 0;
 			int index = -1;
 			string prefix = null;

PROMS/Volian.Controls.Library/DisplayTransition.cs

@@ -195,6 +195,9 @@ namespace Volian.Controls.Library
 			// figure out whether at same level, have same parent and have same HLS:
 			ItemInfo itm1 = _CurTrans.MyItemToID;
 			ItemInfo itm2 = _CurTrans.MyItemRangeID;
+			// Invalid existing transition
+			if (itm2.ActiveParent == null || itm1.ActiveParent == null)
+				return;
 			//if (_CurTrans.TranType == 2 && itm1.ItemID == itm2.ItemID) itm2 = itm1.LastSibling;
 			bool samHLS = itm1.MyHLS.ItemID == itm2.MyHLS.ItemID;
 			int lev1 = 0;