[TIMOB-14206] BlackBerry: ResultSet.isValidRow() and ResultSet.rowCount failed when there is no records in table (Ti SDK 3.1.1)

if (Ti.version < 1.8 ) {
	alert('Sorry - this application template requires Titanium Mobile SDK 1.8 or later');
}

// This is a single context application with mutliple windows in a stack
(function() {
	//determine platform and form factor and render approproate components
	var osname = Ti.Platform.osname,
		version = Ti.Platform.version,
		height = Ti.Platform.displayCaps.platformHeight,
		width = Ti.Platform.displayCaps.platformWidth;
	
	//considering tablet to have one dimension over 900px - this is imperfect, so you should feel free to decide
	//yourself what you consider a tablet form factor for android
	var isTablet = osname === 'ipad' || (osname === 'android' && (width > 899 || height > 899));
	
	    var db = Ti.Database.open("testBB2");
        var sSQL = "Create table if not exists testBB2(key text, value text)";
        db.execute(sSQL);
         db.execute("delete from testBB2");
        //sSQL = "insert into testBB2(key,value) values('1', 'testBB77777')";
        //db.execute(sSQL);
        var rs = db.execute("select * from testBB2");

        if(rs.isValidRow())
        {
            alert(rs.fieldByName('value'));
            rs.next();
        }
 
        alert('completed!');
        rs.close();
        db.close();
	
	/*
	var Window;
	if (isTablet) {
		Window = require('ui/tablet/ApplicationWindow');
	}
	else {
		Window = require('ui/handheld/ApplicationWindow');
	}

	var ApplicationTabGroup = require('ui/common/ApplicationTabGroup');
	new ApplicationTabGroup(Window).open();
	*/
})();

app.js:38
        if(rs.isValidRow())
              ^
TypeError: Cannot call method 'isValidRow' of undefined
    at app.js:38:15
    at app.js:60:3