rem: if (!this.childData) 
add: if (!("childData" in this)) 
context: function tovr_rkids (){    if (!this.childData)        this.childData = new Array();}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/e711edc14f9f9f43c8fc7d007226dcc5ca78ab65/tree-utils.js/clean/extensions/venkman/resources/content/tree-utils.js