rem: return this.mProperties.getProperty(aName); 
add: try { return this.mProperties.getProperty(aName); } catch (e) { return null; } 
context:     getProperty: function (aName) {        return this.mProperties.getProperty(aName);    },
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/b4a3b00ed58fa70e21c7fdade2185d7787d28428/calItemBase.js/buggy/calendar/base/src/calItemBase.js