[bug] Components of type 'select' do not get expected response on 'autoSubmit' on a PDA device

[Piyush Hari]

ello,

on autoSubmit a value in a select component (like selectOneChoice), ambiguous 
data ('undefined') appears within XmlHTTP request string. On investigation, I 
found that this was due to non-initialization of variable in Core.js.

var selectData=""; 
instead of
var selectData;

I will go ahead and file it as a bug and submit the patch. 

-Piyush