Fixed up shuttle demo

Assets/Fungus/Dialog/Commands/Say.cs

@@ -102,7 +102,10 @@ namespace Fungus.Script
 		{
 			foreach (SayOption option in options)
 			{
-				connectedSequences.Add(option.targetSequence);
+				if (option.targetSequence != null)
+				{
+					connectedSequences.Add(option.targetSequence);
+				}
 			}
 		}
 	}

Assets/Fungus/FungusScript/Editor/FungusScriptWindow.cs

@@ -289,6 +289,11 @@ namespace Fungus.Script
 
 		void DrawConnections(FungusScript fungusScript, Sequence sequence, bool highlightedOnly)
 		{
+			if (sequence == null)
+			{
+				return;
+			}
+
 			List<Sequence> connectedSequences = new List<Sequence>();
 
 			bool sequenceIsSelected = (fungusScript.selectedSequence == sequence);
@@ -309,6 +314,11 @@ namespace Fungus.Script
 
 				foreach (Sequence sequenceB in connectedSequences)
 				{
+					if (sequenceB == null)
+					{
+						continue;
+					}
+
 					DrawRectConnection(sequence.nodeRect, sequenceB.nodeRect, highlight);
 				}
 			}