preventing blank xml records outputting as undefined

in my xml file i have a part of it that goes like this

<store>
<name>Harvey Norman Outlets</name>
<address></address>
<suburb></suburb>
<postcode></postcode>
<phone></phone>
</store>

which when it is output through flash it outputs as
Harvey Norman Outlets
undefined
undefined
undefined
undefined

in the dynamic text. thanks to aneeshchopra ive got all the stores to output now, but now i'm just left with this one problem there.

this is the code in the flash file.

function loadXML(loaded) {

if (loaded) {
dB = new Array();
for(var i =0; i < xmlData.firstChild.childNodes.length; i ++){
// this.firstChild.childNodes[] refers to which store record you refer to
// this.firstChild.childNodes[].ChildNodes[0] refers to the store name
// this.firstChild.childNodes[].ChildNodes[1] refers to the store address
// this.firstChild.childNodes[].ChildNodes[2] refers to the store suburb
// this.firstChild.childNodes[].ChildNodes[3] refers to the store phone

_root.presentation.Retailers.waslide.waholder.text += this.firstChild.childNodes[i].childNodes[0].firstChild.nodeValue +  newline + this.firstChild.childNodes[i].childNodes[1].firstChild.nodeValue + newline + this.firstChild.childNodes[i].childNodes[2].firstChild.nodeValue + newline + this.firstChild.childNodes[i].childNodes[3].firstChild.nodeValue + newline + newline;
}
} else {
trace("file not loaded!");
}
}
xmlData = new XML();
xmlData.ignoreWhite = true;
xmlData.onLoad = loadXML;
xmlData.load("wa.xml");

thanks