[TIMOB-14528] Allow custom properties on proxies even if they exist on o...

[pec1985]

...ther proxies

[mtnlife999]

Could I get a simple Javascript test case

[pec1985]

Yes, simple:

var win = Ti.UI.createWindow();

var table = Ti.UI.createTableView({
    data: [
        {title: 'Row 1', url: 'some custom prop 1'},
        {title: 'Row 2', url: 'some custom prop 2'}
    ]
});

table.addEventListener('click', function(e){
    alert(e.rowData.url);
});

win.add(table);

win.open();

Clicking on the row will suppose to alert the custom property, which is the url of the rows. Since the webview has a url property, this sample code will return undefined. This PR fixed that.