Ext.data.TreeStore.fillnode error when ajax request failed

Sencha Touch version tested:

• 1.1.0

Platform tested against:

• iOS 3.x
• iOS 4
• Android 2.1
• Android 2.2

Description:

• The function fillnode of Ext.data.TreeStore.fillnode doesn't check if records exists, therefore if json file was not found, it tries to set the variable ln to records.length and you get a javascript typeError

Test Case:
in the kitchensink sample, rename the file carregions.json as wrongfilename.json, this will make a 404 error in the AJAX call, and the TreeStore will not handle it correctly

Steps to reproduce the problem:

• use kitchen sink sample
• rename carregions.json

The result that was expected:

• an empty list in the nested list display

The result that occurs instead:

• script error

Possible fix:

• in the function fillnode do ln = records?records.length:0