Better error handling in 'Call a Lua Function' k2node

Source/Integration/LuaCallNode.h

@@ -78,6 +78,7 @@ private:
 	static const FName InvokeOrProbePinName;
 	static const FName PlacePinName;
 	static const FName ExtraResultsPinName;
+	static const FName ErrorPinName;
 
 	/** Utility functions for manipulating pin names with prefixes **/
 	static bool IsPrefix(const UEdGraphPin *Pin, char Prefix);
@@ -88,6 +89,11 @@ private:
 	/** The lua function prototype, which must be saved as a property **/
 	UPROPERTY()
 	FString LuaFunctionPrototype;
+
+	/** Equal to the invoke-or-probe property **/
+	UPROPERTY()
+	FString InvokeOrProbe;
+
 	
 	/** Tooltip text for this node. */
 	FText NodeTooltip;