Fix a Flash file

I have a little script I had written years ago that runs in a program called 'Swish' which is a Flash alternative. The script allows the dynamic update of embedded text bodies by calling to an XML file that exists on a server. In some cases the XML file is edited by an end user via a CMS interface who may find it necessary to leave some of the entries blank based on the situation. Unfortunately, the script returns and displays the word 'undefinded' for that said entry when the XML value returns a null. I looking for someone to simply edit the script so that it to displays nothing upon a null value read in the XML file rather than 'undefinded'. I can manually enter in an invisible character in an XML value by typing ALT-0160 but this is not a realistic request for end users. I've attached a sample of the files for review.